Divided Bevel Gear Wheel for Smooth Marine Gear Shifting
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Solution Overview
Problem
Current marine engine power transmission systems require an obligatory pause in the neutral state between gear changes, leading to gear wear and slower shifting due to the absence of a clutch and synchronizing mechanism.
Innovation Solution
The implementation of a divided bevel gear wheel system with two elastic elements of different spring constants, allowing for smooth engagement and load handling, which enables quicker and smoother gear changes without the need for a pause in the neutral state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pause in the neutral state is implemented between gear changes, then gear wear is reduced, but shifting speed decreases and time is lost
Solution Approach 1:
The gear wheel is divided into two independent parts: an inner part that can be engaged/disengaged from the prop shaft, and an outer part that remains constantly engaged with the drive pinion. This segmentation allows the inner part to be quickly disconnected during gear changes while the outer part maintains continuous power transmission, eliminating the need for a pause in the neutral state and reducing shifting time without increasing gear wear.
2Productivity
If a clutch and synchronizing mechanism are added to eliminate the pause in neutral state, then shifting speed increases, but device complexity increases
Solution Approach 1:
The gear wheel is divided into two independent parts: an inner part that can be engaged/disengaged from the prop shaft, and an outer part that remains constantly engaged with the drive pinion. This segmentation allows the inner part to be quickly disconnected during gear changes while the outer part maintains continuous power transmission, eliminating the need for a pause in the neutral state and reducing shifting time without increasing gear wear.
Solution Approach 2:
The inner part of the gear wheel is designed to be dynamically engageable and disengageable from the prop shaft through a simple dog clutch type selector mechanism. This dynamic configuration allows rapid gear changes without requiring complex clutch or synchronizing mechanisms, achieving high shifting speed with minimal added complexity.
3Ease of operation
If the same lever controls both throttle and power transmission system, then ease of operation is improved, but the risk of damage to power transmission increases due to improper timing
Solution Approach 1:
The inner part of the gear wheel is designed to be dynamically engageable and disengageable from the prop shaft through a simple dog clutch type selector mechanism. This dynamic configuration allows rapid gear changes without requiring complex clutch or synchronizing mechanisms, achieving high shifting speed with minimal added complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces gear wear and facilitates faster, smoother gear shifting by compensating for differences in angular velocities and handling torque peaks, effectively eliminating the need for a pause in the neutral state during gear changes.
Implementation Method 1
a first elastic element which is longer in relation to the second elastic element and is initially deformed upon deflection of the outer part in relation to the inner part of the divided gear wheel
Implementation Method 2
the divided gear wheel of my proposal operates as a double mass flywheel, with analogous advantages
Data Source
AI summary
The present application relates to power transmission system used in marine engines and in particular to a divided gear wheel (11, 12), for a power transmission system 1,2, used in marine engines, to a power transmission system used in marine engines to a method to operate said power transmission system and to a marine engine comprising a power transmission system.