3901774 Flywheel Ring Gear Ring 159 - Teeth Excavator Part J901774
Specifiion
Type | Flywheel Ring Gear |
Model | 159T |
Part No | 3901774 / J901774 |
Standard Component | Standard Component |
Technics | Casting |
Warranty | 6 month |
Condition | New |
Driving System Parts | Wheel |
Package | Neutral packing |
Steering System Parts | Steering Gear |
Description
A freewheel assembly is also widely used on engine starters as a
kind of protective device. Starter motors usually need to spin at
3,000 RPM to get the engine to turn over. When the key is held in
the start position for any amount of time after the engine has
started, the starter can not spin fast enough to keep up with the
flywheel. Because of the extreme gear ratio between starter gear
and flywheel (about 15 or 20:1) it would spin the starter armature
at dangerously high speeds, causing an explosion when the
centripetal force acting on the copper coils wound in the armature
can no longer resist the outward force acting on them. In starters
without the freewheel or overrun clutch this would be a major
problem because, with the flywheel spinning at about 1,000 RPM at
idle, the starter, if engaged with the flywheel, would be forced to
spin between 15,000 and 20,000 RPM. Once the engine has turned over
and is running, the overrun clutch releases the starter from the
flywheel and prevents the gears from re-meshing (as in an
accidental turning of the ignition key) while the engine is
running. A freewheel clutch is now used in many motorcycles with an
electric starter motor. It is used as a replacement for the Bendix
drive used on most auto starters because it reduces the electrical
needs of the starting system.
Purpose
1.The flywheel for most automatic transmissions/transaxles is
simply a stamped-steel disc with a ring gear loed at the outer edge
for engagement with the starter’s pinion gear. With this type of
flywheel, the torque converter has no ring gear. Some cars use a
more modest flywheel known as a flexplate, which is all that’s
needed because the torque converter itself has a ring gear loed on
its outer edge.
2.The flywheel, or flexplate, mounts to the engine's crankshaft and
also serves as a mounting loion for the torque converter.
Consequently, the flywheel or flexplate transmits engine torque to
the torque converter housing. The flywheel’s ring gear also serves
as an engagement point for the pinion of the starter motor when
cranking the engine. Because of the lightweight design of the
flywheel or flexplate, it does not help to smooth out power pulses
from the engine like the flywheel does on a car with a manual
transmission. On cars with automatic transmissions, the torque
converter provides this function.
3.The flywheel/flexplate does not require regular maintenance.
Sometimes, the ring gear may suffer damage from improper starter
engagement or alignment. If this is the case, the ring gear or
flywheel may need replacement.
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