Abstract: In a method of adjusting the balance of the rotor of an AC generator which comprises a pair of magnetic pole cores with magnetic pole claws which are intertwined with each other, the amount and direction of unbalance of the rotor are detected, the amount of unbalance thus detected is divided into two components along the center lines of adjacent magnetic pole claws, a hole is drilled in the outer peripheral surface of the magnetic pole claw on which the larger of the components lies in such a manner that the hole is in alignment with the center line of the magnetic pole claw; and those operations are carried out repeatedly until the balance thus adjusted falls in a predetermined range of allowance, whereby the balance of the rotor is readily adjusted with high accuracy.

Abstract: A control device of a vehicle-mounted, self-excited alternator for supplying a field current to its field coil and selectively a charge current to a battery and a power to a high voltage electric load of the vehicle comprises a field current detector for detecting field current flowing through the field coil and a field current limiter which includes a reference device for providing a fixed reference value, a comparator for comparing the field current detected by the field current detector with the fixed reference value and a voltage regulator control device responsive to an output of the comparator to control the voltage regulator to cut-off the field current when the field current detected is larger than the reference value.

Abstract: An alternating current generator for vehicles in which the exciting current flowing in the field winding (2) is detected and the current thus detected is suppressed not to exceed the maximum exciting current under the hot condition by the field current limiting circuit (5) for aiming at eliminating the generation of the maximum output under the cold condition to reduce the size of a pulley to result in a reduced vehicle weight and preventing the variation of the maximum output characteristic under the hot condition.

Abstract: An alternator for motor vehicles having a mounting structure suitable for mounting to an engine, in which at least one mounting projecting section having U-grooves in a direction perpendicular to the direction of the axis of rotation is formed integral with each of the front and rear brackets constituting a housing so as to enable mounting the alternator to an engine. The alternator thus constituted has a simple, low-cost mounting structure and improved strength such as vibration resistance.

Abstract: A vacuum pump comprises a slide shaft having one end provided with a discharging valve and a diaphragm, a cam plate in press-contact with the other end of the slide shaft to cause reciprocating movement of the slide shaft, a shaft of a motor for rotating the cam plate and a bearing casing for holding a bearing which supports the motor shaft in a freely rotatable manner, wherein the cam plate is provided at its one side surface with a recess for receiving the bearing and provided at its other side surface with a cam surface.

Abstract: A vehicle mounted a.c. generator includes an annular water coolant passage 32b around a stator coil 11 and a branch coolant passage 32c extending from an inlet portion of the annular coolant passage to a return portion thereof. An air circulation fan 60 may also be provided inside a front bracket 26 of the generator. Various embodiments include supplemental heat pipes and bearing coolant passages.

Abstract: A control apparatus for a vehicular generator for use in an automobile, etc., in which the temperature of the generator is detected so as to control switching of the field current of the generator when the temperature of the generator is below a predetermined value, so that the cold output current and cold drive torque of the generator are substantially the same as the hot output current and hot drive torque of the generator.

Abstract: A rolling bearing device comprises a ball bearing having an outer ring and an inner ring to which a rotating shaft is fitted, a snap ring fitted in an eccentric annular groove formed in the outer circumferential surface of the outer ring of the ball bearing, the snap ring having a head portion projecting in the radial direction from the groove and an inner circumferential part supporting the ball bearing therein. The inner circumferential part is provided with a small diameter part to which the outer ring of the ball bearing is fitted and a large diameter part having a diameter greater than that of the small diameter part but allowing passing of the head portion of the snap ring.

Abstract: A control device for an alternator which can be fabricated as a single hybrid integrated circuit. The output of the alternator which is to be used to drive the field coil of the generator is rectified, and the rectified voltage is voltage divided by two resistors, one of which has a smoothing capacitor connected in parallel therewith. A detection and amplification transistor amplifies the signal at the junction point of the resistors and applies the amplified signal through a Zener diode to the base of a control transistor, the latter driving a switching transistor which controls the amount of current passing through the field coil of the generator.

Abstract: A charging generator system including a protective circuit which prevents the generator system from overheating when the ambient temperature is extraordinarily high. A protective shorting circuit is coupled between a rectifier output terminal supplying the field coil of the generator and the ground terminal. The protective shorting circuit has a high resistance for normal temperatures and a low resistance for high temperatures, thereby to interrupt the current flow in the field coil when high temperatures occur. In one embodiment, the protective shorting circuit means is implemented with a single thermistor. In another embodiment, a protective transistor is coupled to the field coil, and base current is supplied to the protective transistor when the temperature rises above a predetermined level to thereby shut off the current flow through the field coil under such conditions.

Abstract: A waterproof ball bearing device comprises an inner ring, an outer ring arranged coaxially with the inner ring, a plurality of balls held between the inner and outer rings, rubber-sealing plates placed at both sides of the balls to cover openings formed between the inner and outer rings, wherein at least one of the rubber-sealing plates is provided with an annular projection in a cylindrical form extending from the outer surface along the center axis of the inner and outer rings.

Abstract: A control apparatus for controlling the power supply to the field coil of a charging generator in which a smoothing capacitor of a low capacitance value is provided to prevent maloperation in the control circuit due to ripples in the output of the generator. A switching transistor controls the current flow through the field coil, while a control transistor controls the switching transistor and a zener diode is provided for energizing the control transistor. A first detection circuit is connected to the smoothing capacitor for detecting the rectified output of the generator and thereby producing a voltage at a first detection point. A second detection circuit produces a voltage at a second detection point which is higher than the first detection point voltage. An amplifying transistor having a base connected to the first detection point energizes the zener diode in accordance with the state of the output of either of the first and second detection circuits.

Abstract: A charge display circuit for indicating the charging state of an automotive electrical system in which the brightness of the charge display lamp is increased while reducing the average power consumption of the circuit. A rectifier circuit having first and second DC output terminals and an AC input terminal is connected to the output winding assembly of an AC generator with the first DC output terminal connected to one terminal of the battery to charge the battery. A charge display lamp is connected through a key switch between the second DC output terminal and the charging terminal of the battery. A resistor having a positive temperature coefficient is connected between the connecting point of the charge display lamp and second DC output terminal and a ground terminal. The resistor may be implemented as a plurality of resistors having positive temperature coefficients connected in parallel with one another, or as a fixed resistor connected in parallel with a resistor having a positive temperature coefficient.

Abstract: The present invention relates to a power supply system for vehicles having a generator which includes an armature coil for generating three-phase alternating current, a field coil held in opposition to the armature coil, a rectifier for converting an A.C. output of the armature coil into a direct current, and a voltage regulator for setting the generated voltage of the armature coil at a constant value by controlling a current flowing through the field coil, and a first battery which is connected across output terminals of the generator; a starting motor and an electric load connected in parallel with the first battery; and consists of a two-battery power supply system for vehicles comprising a second battery which is connected to an ignition device separately from said first battery, and which is charged by a power source other than said generator.

Abstract: A rectifier has a pair of heat dissipating plates at the positive (+) side and the negative (-) side which constitute a full-wave rectification circuit and are positioned in mutual confrontation with a small gap between them, and an insulating material to electrically insulate the both heat dissipating plates. A recessed portion is formed in each of the mutually opposed parts of the both heat dissipating plates; a noise-preventing capacitor element is housed in a closed space defined by the recessed portions to make an outer covering for the capacitor, and the capacitor element and each of the heat dissipating plates are electrically connected.

Abstract: A brush holder for a charging generator for a car comprises a one-piece resin-molded body in which a pair of recesses for holding brushes are formed and a plurality of terminal plates are embedded except for small exposed parts to which lead wires of a voltage regulator and lead wires of said brushes are soldered. A brush is disposed in each of the recesses, and each of the brushes is connected to one of the lead wires which is also connected to a corresponding one of the terminals.

Abstract: An a.c. generator for a car comprises a waterproof cylinder made of a plastic resin which covers the outer periphery of slip rings, a first flat plate to separate and insulate an external terminal from a bracket, and a second flat plate extending toward a rectifier with a predetermined gap between the second flat plate and the rectifier.

Abstract: An alternating current (AC) generator of the type used in vehicular applications and driven by the vehicle engine has a stator winding and a field winding wherein the electrical resistance of the field winding varies as a function of temperature. An exciting current intermittently is allowed to flow through the field winding which induces a current in the stator winding. The output of the stator is rectified and used to charge the vehicle battery. The invention comprises inclusion of field winding current compensation apparatus which varies as a function of temperature to reduce undesired field winding current variations due to temperature which results in improvements of power output and stabilized generator driving torque.

Abstract: A partition plate structure for a cooling fan for an alternating current generator constructed in such a manner that an inner part of the rear bracket is inwardly extended in the radial direction to provide an extended surface so as to face the blade with a predetermined distance in an area where the rectifier and the brush holder are not placed; a first partition plate to be fastened to the rear bracket together with the rectifier and a second partition plate to be fastened to the rear bracket together with the brush holder are respectively placed in the rear bracket so as to be substantially flush with the extended surface.

Abstract: An electric generator for a vehicle has a rotary generator shaft, a generator rotor mounted on the shaft and having a field winding, a bracket surrounding the generator rotor and having the generator shaft rotatably journalled therein, an inductor fixed to the bracket means and having an energizing coil with a plurality of poles, and an induced member rotatably mounted on the rotary generator shaft and opposed to the inductor with a minute gap therebetween, so as to be coupled to the inductor by an electromagnetic force when the energizing coil receives current from the generator. The generator stator is disposed around the generator rotor and has an armature winding with a number of poles exceeding twice the number of poles of the inductor and for generating an AC output usable for supplying power to a load outside the generator. The energizing coil is connected to the armature winding for receiving a part of the AC output for energizing the energizing coil.