Marine Engine Offset Power Take-Off for Deck Clearance
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Solution Overview
Problem
Existing marine engines, specifically those adapted from automotive applications, pose challenges in terms of height and accessibility, leading to compromised boat designs due to their vertical dimensions and the need for engine covers that occupy valuable passenger space.
Innovation Solution
A marine engine with reduced vertical dimensions, optimized geometry, and strategically positioned components to allow installation under the deck floor, featuring an offset power take-off assembly and angled cylinder banks, enabling proper alignment with the driveshaft and minimizing the need for an engine cover above the deck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automotive engines are adapted for marine use, then engine power and reliability are improved, but engine height increases and valuable passenger space is occupied
Solution Approach 1:
The patent repositions the power take-off assembly from a coaxial arrangement (above the crankshaft) to an offset arrangement (at the side of the crankshaft). This dimensional change in the spatial relationship between components allows the engine to be mounted lower in the hull while still achieving the necessary driveshaft alignment, thereby reducing engine height and freeing passenger space without sacrificing power transmission capability
2Power
If automotive engines are adapted for marine use, then engine power is improved, but accessibility for maintenance deteriorates
Solution Approach 1:
The patent inverts the conventional power take-off arrangement by positioning it at the side of the crankshaft rather than above it. This inversion places previously hidden components (such as the power take-off assembly and associated drivetrain components) into accessible positions that can be reached from above the engine, eliminating the need to work underneath the engine and significantly improving maintenance accessibility while preserving engine power output
3Manufacturing precision
If engine is mounted high above hull bottom, then driveshaft alignment is improved, but engine height increases and passenger space is reduced
Solution Approach 1:
The patent changes the spatial dimension of the power take-off assembly from a vertical arrangement (coaxial with crankshaft, requiring high engine mounting) to a horizontal/offset arrangement (at the side of crankshaft). This dimensional repositioning allows the engine to be mounted lower in the hull while maintaining proper driveshaft alignment through the offset connection point, thereby resolving the contradiction between alignment precision and engine height
Data Source
AI summary
A boat has a hull, a deck having a deck floor, and an engine disposed in the hull. A top of the engine is disposed vertically below the deck floor. The engine includes a crankcase, a crankshaft, a pair of cylinder banks connected to the crankcase at an angle relative to each other. A transom extends generally vertically upwardly from a rear portion of the hull. A stern drive unit is connected to the transom and is operatively connected to the engine through the transom. In another aspect, a marine engine has a crankcase, a cylinder block, and a crankshaft. An output shaft is disposed vertically above the crankshaft. The output shaft is disposed at least partially internal to the engine. A drive, internal to the engine, is operatively connected to the crankshaft and the output shaft. A driveshaft coupling is disposed on the output shaft.