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Starter Drives

Starter Drives. DRIVE FEATURES. PINION DRIVE GEAR MESHES WITH FLYWHEEL GEAR MUST ENGAGE BEFORE ROTATION Called Positive Engagement PINION GEAR TEETH ARE TAPERED ENGINE MUST NOT ROTATE THE STARTER NORMAL CRANKING SPEED IS 200 RPM. 15-20 to 1.

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Starter Drives

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  1. Starter Drives

  2. DRIVE FEATURES • PINION DRIVE GEAR MESHES WITH FLYWHEEL GEAR • MUST ENGAGE BEFORE ROTATION • Called Positive Engagement • PINION GEAR TEETH ARE TAPERED • ENGINE MUST NOT ROTATE THE STARTER • NORMAL CRANKING SPEED IS 200 RPM

  3. 15-20 to 1 Due to ratio between drive and ring gear, the drive must rotate over 3000 rpm to turn engine at 200 rpm

  4. Drive Assembly • Drive gear to mesh with flywheel ring gear • Overrunning clutch to prevent engine from driving starter once engine starts but operator hasn’t yet released the key switch • Drive is splined to armature shaft • Two types of splines, 1st Dyer Drive, splines are helical, allows drive to slightly rotate. Drive engages easier with ring gear • 2nd type splines are straight cut, can cause tooth abutment issues, drive does not slightly rotate as engages ring gear

  5. Two types of Starters • Direct Drive • Gear Reduction Drive

  6. Direct Drive • Drive is splined directly to armature • Most common type of starter • Cheaper to manufacture, and repair • Contains less parts than reduction type

  7. Breakdown of Direct Drive Starter

  8. Gear Reduction Type Pros • A set of gears or planetary gear set connect armature to drive assembly • Higher torque output from reduction gears • Turns engine faster through compression cycles • Smaller and lighter starter motor • More efficient, less electrical energy converted to heat. Motor will last longer.

  9. Gear Reduction Type Cons • Greater number of parts, more costly to manufacture and repair • Current through solenoid can be much higher (over 200 amps), must use proper starter relay

  10. Breakdown of planetary type reduction starter

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