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The Application -- The universal joint coupler is a key component in the
drive train of the Mercury Marine Inboard-Outboard engines. The double-center universal
joint transmits power from the in-board engine to the out-board stern drive unit and
allows the drive unit to:
- pivot for steering
- change the propeller angle-of-attack
- provide easy access to the propeller and lower drive
section for maintenance and inspection.
Component Description -- The coupler is a 3 ½ in diameter ring with 4 tabs (with holes for the
coupling pins) extending from the ring, two on each side. The overall length is 4 inches
and the weight is approximately 2 pounds.
- The critical performance and engineering issues for
the coupler are fatigue life and precise dimensional tolerances for assembly and
alignment.
- The annual production is 250,000 units.
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