DIAGRAM OF STARTER MOTOR

diagram of starter motor

diagram of starter motor

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Starter Motor Diagram: Components and Structure

A starter motor diagram illustrates the mechanical and electrical components that work together to crank an engine. Below is a detailed breakdown of its key elements, often visualized in technical diagrams, along with their roles and interactions.

Main Components in a Starter Motor Diagram

1. Electrical and Magnetic Components

  • Armature
    • The central rotating shaft with copper wire windings, generating torque when energized.
    • Diagram note: Showcased as a cylindrical core with spiral windings around a central axis.
  • Field Windings or Permanent Magnets
    • Field windings: Coils surrounding the armature (depicted as concentric loops in diagrams).
    • Permanent magnets: Solid magnetic blocks (often labeled "PM") in modern starters, replacing windings for compact design.
  • Commutator
    • A segmented copper cylinder on the armature shaft (diagrammed as a ring with alternating conductive segments).
    • Connects to armature windings and reverses current flow via brushes.
  • Brushes and Brush Holders
    • Brushes: Graphite blocks (marked with springs) making contact with the commutator (diagram: vertical blocks pressing against the commutator ring).
    • Brush holders: Insulated brackets securing brushes (labeled "BH" in technical schematics).

2. Mechanical Drivetrain Components

  • Solenoid
    • An electromagnetic switch (drawn as a cylindrical housing with terminals: "50" (ignition), "30" (battery), and "C" (starter)).
    • Internal components: Pull - in coil, hold - in coil, and plunger (depicted as a rod moving left/right when energized).
  • Pinion Gear and Overrunning Clutch
    • Pinion gear: Small toothed wheel (labeled "PG") meshing with the engine’s flywheel ring gear.
    • Overrunning clutch: A cylindrical mechanism (often shown as a spring - loaded assembly) connecting the pinion to the armature shaft, preventing backspin.
  • Lever Fork (Shift Lever)
    • A U - shaped or L - shaped linkage (diagrammed with arrows indicating motion) that transfers the solenoid plunger’s movement to the pinion gear.

3. Electrical Connections and Terminals

  • Starter Relay
    • A separate component (often shown outside the starter motor) with terminals "85," "86," "30," and "87," connecting the ignition switch to the solenoid.
  • Wiring Harness
    • Thick cables (labeled "B+") from the battery to the solenoid terminal "30," and a thinner wire from the ignition switch to terminal "50."

4. Housing and Mounting

  • Starter Casing
    • A metal enclosure (diagrammed as a cylindrical or rectangular shell) with mounting flanges (marked "MF") for attaching to the engine block.
  • End Caps
    • Seals at both ends of the housing, supporting the armature shaft with bearings (labeled "BR").

How a Starter Motor Works (Diagram Context)

  1. Activation: The ignition switch sends current to the solenoid (terminal "50"), energizing its coils.
  2. Solenoid Action: The plunger pushes the lever fork, engaging the pinion gear with the flywheel.
  3. Current Flow: The solenoid connects battery power (terminal "30") to the starter motor (terminal "C"), driving the armature to rotate.
  4. Cranking: The pinion turns the flywheel, starting the engine; the overrunning clutch disengages the pinion once the engine runs.
 
For detailed starter motor diagrams, exploded views, or component identification guides, visit:
https://www.starterstock.com/
(Note: The website offers technical diagrams, parts illustrations, and replacement guides for various starter motor models.)

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