Robert Boschgmbh

Wolfgang Kofink

Georg Binder

To separate cooling fluid, such as water, from the commutator space of a dynamo electric machine, typically a motor for battery-energized vehicle, a disc (18) of insulating material is fitted on the commutator (5), terminating at its end portion in a slinger structure (20, 21) which is positioned in intergaging relation with respect to a labyrinth (21, 22) secured to the housing of the machine. Cooling fluid is admitted to the space within which all the electrical windings (3, 9) are located, so that the cooling fluid, for example water, can fill the space (28) of the housing, while being separated from the space (57) within which the commutator (5) and commutator brush holder (7) is located.

Liquid cooled commutation-type dynamo electric machine

A slip ring less, three-phase, AC generator especially for motor vehicles, in which the compound winding is subdivided into individual components which are directly interconnected within the branches of the rectifier bridge supplying direct current for the on-board electrical system so that the voltage drop across the compound winding is sensed and compensated by the regulator. The compound winding can be wound of wire having a small diameter.

Electrical generator

In order to improve the lubrication of relatively moving parts of machinery, in particular of bearings carrying rotating shafts, there is provided a lubricant reservoir adjacent to the bearing in which a movable transport member is located. The transport member may be, for example, a spring, one end of which is attached to the shaft rotating in the bearing so that the centrifugal force imparted to the spring causes its free end to enter into the lubricant reservoir whereupon, when the shaft is slowed down or stopped, the elasticity of the spring causes its return to a rest position, during which lubricant is positively displaced in the direction of the bearing. The motion of the transport member may also be effected by other external influences, for example by a magnetic field.

Apparatus for long-term bearing lubrication

For more effective cooling of directly driven claw-pole, typically automotive alternators, a system of internal passageways is provided through which cooling oil is forced from the pressurized engine oil supply system. The oil flows directly over surfaces of the rectifiers or their heat sink, the exciter core, and the stator housing. A portion of the oil is branched off in a metered quantity at the inlet directly to a shaft bearing, which it cools and lubricates. Various passageways systems are described, including one which permits electrical feed-throughs and the diodes to be mounted dry. A particular configuration is described for a shaft bearing, in which between an armor bushing and a cast bearing support hub there are annular oil channels connected to longitudinal oil channels to evenly distribute the pressurized oil around the bearing.

Oil cooling for an electrical generator

A drive motor that may be an internal combustion engine or an electric motor is operated at substantially constant speed or, in the case of an internal combustion engine, at one of two substantially constant speeds. The speed of travel of the vehicle under various load conditions is varied by a drive control pedal operating a transducer that furnishes one input to a signal processor while a torque transducer in the engine drive shaft provides a second input to the processor. The processor output controls the positioning device that determines the transmission ratio of a continuously variable belt drive transmission by pressing together the halves of one pulley of the belt drive while separating the halves of the other pulley, varying their effective diameter with respect to the wedge-shaped belt in opposite directions. When an internal combustion engine is used as the drive motor, the engine speed can be selectably the maximum-torque speed or the maximum-power speed and the selection can be made automatic by means of limit switches operating at the respective extremes of the variable belt drive control range. When an electric motor is used as the drive motor, a compound-wound motor is operated at a speed in the transition range between behavior mainly as a series-wound motor and behavior mainly as a shunt-wound motor.

Apparatus for control of a continuously variable belt drive for

To supply intermittently required high-power loads, such as heater applications in an automotive vehicle, a dual armature winding three-phase alternator has a first or main winding connected to a first or main rectifier bank to supply power to vehicular loads, for example at 12 V nominal level; an auxiliary winding is connected to a rectifier which can be switched to operate as a half-wave rectifier, in parallel with the main winding and main rectifier to supply the ordinary loads when high-power loads are not connected; or to be switched in a full-wave bridge rectifier configuration to provide additional power at elevated voltage, added to the voltage of the rectifier receiving current from the main windings, for example providing 16.multidot..sqroot.3=28 V added to the nominal supply voltage of 12 V=40 V voltage to the heater load.

Method and system to supply electrical energy to a self-contained

In known generators and motors a regulator circuit connected in series with the exciter winding creates too much resistance to allow self-excitation to start at very low speeds. The regulator circuit is therefore shunted by a positive temperature coefficient resistor. This has very low resistance at low temperatures causing sufficient current flow through the exciter winding even at low speeds.

Self-excited dynamo-electric machines with improved start-up

To provide for automatic charging of two batteries which are series connected, particularly to supply the on-board network of an automotive vehicle from a main battery and to supply additional higher surge voltage output to the vehicle starter, a three phase alternator has output rectifiers connected to two phases, and the rectifier to the main battery, the third phase with its rectifier being connected to the auxiliary battery. The third phase rectifier may, instead of diodes, include a diode-transistor combination, the transistor being controlled by voltage of the second battery to, selectively, charge the second battery or connect the third phase for charging of the main battery. The phase windings of the alternator may all be identical, the lighter loading of the phase connected to the additional battery providing the higher output voltage required thereby.

Growing community of inventors

Aichwald, Germany

Wolfgang Kofink