Generator 371.3701: 1 – pressure sleeve; 2 – bushing; 3 – buffer sleeve; 4 – protective cover; 5 – rectifier block mounting screw; 6 – rectifier block; 7 – rectifier block valve; 8 – capacitor; 9 – rear rotor shaft bearing; 10 – slip rings; 11 – rotor shaft; 12 – brush connected to terminal "B" of the voltage regulator; 13 – pin "30" for connecting consumers; 14 - brush connected to the output "W" of the voltage regulator; 15 – terminal "B" of the voltage regulator; 16 – voltage regulator; 17 – output "61" of the generator; 18 – generator mounting stud to tension bar; 19 – impeller; 20 – pulley; 21 – bearing mounting plates; 22 – thrust ring; 23 – front rotor shaft bearing; 24 – rotor winding; 25 – rotor pole tip; 26 – stator winding; 27 – stator; 28 – front cover (from the drive side).
Wiring diagram of generator 371.3701: 1 – battery; 2 – generator; 3 – instrument cluster; 4 – 51 Ohm resistor, 5 W; 5 – diode; 6 – Battery charge indicator lamp; 7 – fuse box; 8 – ignition relay; 9 – ignition switch.
Generator 9412.3701: 1 – casing; 2 – output "B" for connecting consumers; 3 – capacitor; 4 – common terminal of additional diodes (connects to terminal "D" of the voltage regulator); 5 – holder of positive diodes of the rectifier block; 6 – holder of negative diodes of the rectifier block; 7 – positive diode; 8 – negative diode; 9 – voltage regulator; 10 – back cover; 11 – tension screw; 12 – front cover; 13 – stator winding; 14 – thrust ring; 15 – front rotor shaft bearing; 16 – pulley; 17 – nut; 18 – rotor shaft; 19 – cone washer; 20 – washer; 21 – rotor pole pieces; 22 – stator core; 23 – bushing; 24 – rotor winding; 25 – rear rotor shaft bearing; 26 – bearing sleeve; 27 – slip rings; 28 – brush holder; 29 – stator winding terminals; 30 – additional diode; 31 – pin "D" (common terminal of additional diodes).
The VAZ-21213 engine is equipped with a generator of type 371.3701, and the VAZ-21214 engine is equipped with a generator of type 9412.3701. These generators are structurally similar and are synchronous electric machines of alternating current with electromagnetic excitation, with a built-in rectifier on silicon diodes and an electronic voltage regulator. The generator rotor is driven from the engine crankshaft pulley by a V-belt.
Technical characteristics of the generator 371.3701
|
Maximum output current (at 13 V and 6000 min⁻¹), A |
80 |
| Voltage, V | 13,2–14,7
|
| Direction of rotation (from the drive side) | right
|
The stator and generator covers are pulled together with four bolts. The rotor shaft rotates in bearings installed in the covers. The grease put into the bearings at the factory is designed for the entire service life of the generator. The rear bearing of the 9412.3701 generator is pressed onto the rotor shaft and is pressed by the rear cover through a plastic bushing, the front bearing is pressed and rolled into the front cover and is replaced only together with it. Its inner race together with the thrust ring and washer is clamped with a nut between the pulley and the step on the rotor shaft. The front bearing of the 371.3701 generator is pulled together with four screws between the inner and outer plates and can be replaced separately from the front cover. The rear part of the 9412.3701 generator is covered with a plastic casing with latches. On the rear cover of the 371.3701 generator, a casing with a rubber air intake is installed, allowing air to be taken in for cooling the generator from the upper part of the underhood space, which reduces the likelihood of water getting into the generator when driving through deep puddles and fords. On the 21214 engine, this danger is less, since instead of a mechanical fan of the cooling system (which inevitably splashes water), there are electric fans installed there, and they are also located in front of the radiator.
(The article is copied from the website VazBook.ru)
The generator stator contains a three-phase winding, made according to the "star" scheme (the terminals of the phase windings have a common point). The second ends of the phase windings are connected to a rectifier bridge consisting of six silicon diodes (valves) - three "positive" and three "negative". The valves are pressed into two horseshoe-shaped aluminum plate holders in accordance with polarity (positive and negative - on different plates); one of the plates also contains three additional diodes, through which the generator excitation winding is powered after the engine is started. The plates are combined into a rectifier unit, fixed to the rear cover of the generator (under the plastic casing of the generator 9412.3701).
The excitation winding is located on the generator rotor, its terminals are soldered to two copper contact rings on the rotor shaft. Power is supplied to the excitation winding through two carbon brushes. The contact rings of the generator 9412.3701 have a reduced diameter - this reduces the peripheral speed of rotation and reduces brush wear. The brush holder is structurally combined with the voltage regulator and is fixed to the rear cover of the generator. The voltage regulator is non-separable, if it fails, it is replaced.
Until 1996, the 371.3701 generator had a brush holder and voltage regulator as separate units (the control voltage from terminal "30" of the generator was supplied to terminal "B" of the voltage regulator). Now the voltage is supplied only to terminal "B" (terminal "B" is missing). The new and old voltage regulators are identical in their characteristics and are interchangeable when assembled with the brush holder.
To protect the on-board network from voltage surges during ignition system operation and to reduce interference with radio reception, a capacitor with a capacity of 2.2 μF -20% is connected between the terminals of the "positive" and "negative" valves (between the "+" and "ground" of the generator), located on the rectifier block of the generator 9412.3701 and the rear cover of the generator 371.3701.
When the ignition is turned on, voltage is supplied to the excitation winding of the generator (terminal "D" of the generator 9412.3701 and "B" of the generator 371.3701) through the control lamp in the instrument cluster (the lamp is on) and resistors connected in parallel to it. After the engine starts, the excitation winding is powered by additional diodes of the rectifier block (the control lamp goes out). If the lamp lights up after starting the engine, this indicates a malfunction of the generator or its circuits.
Attention! The "minus" of the storage battery must always be connected to the "ground" of the car, and the "plus" - to the "B" terminal of the generator 9412.3701 (terminal "30" - generator 371.3701). Reverse connection will lead to breakdown of the generator valves.
It is not recommended to disconnect the battery when the generator is running (especially on engines equipped with a fuel injection system). The resulting voltage surges in the on-board network can damage the electronic components of the circuit.
Generator valves (and other devices in the vehicle's on-board network when the generator is connected) should be tested under voltage no higher than 14 V, higher voltage (for example, when checking with a megohmmeter) may cause damage to the valves. If it is necessary to check the insulation of the windings with high voltage, the generator should be removed and the winding terminals should be disconnected from the rectifier unit and voltage regulator.