Helical Spline Torque Absorber for Bidirectional Vessel Propulsion Loads
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Solution Overview
Problem
Existing vessel propulsion systems struggle to effectively absorb bidirectional torque fluctuations, particularly during engine acceleration and deceleration, which can lead to inefficiencies and mechanical stress.
Innovation Solution
A torque fluctuation absorber system comprising a gear train, a supercharger, and a torque fluctuation absorber with a first and second helical spline coupling, along with springs, that moves axially to absorb torque fluctuations by compressing springs in opposite directions, allowing for bidirectional torque absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way clutch is used as a torque fluctuation absorber, then torque fluctuations during deceleration are absorbed, but torque fluctuations during acceleration cannot be absorbed
Solution Approach 1:
The patent employs a dynamic torque fluctuation absorber mechanism that can respond to torque fluctuations in both directions (acceleration and deceleration). The absorber includes a movable member that can shift position along the axial direction in response to torque changes, allowing it to absorb fluctuations dynamically regardless of direction, thereby resolving the limitation of one-way clutches that only work in one direction.
Solution Approach 2:
The invention changes the operational parameters of the torque fluctuation absorber by enabling it to function effectively in both acceleration and deceleration phases. The absorber's internal mechanism allows it to adapt to different torque directions by changing the position and configuration of its movable components, thus achieving bidirectional torque fluctuation absorption.
2Reliability
If the intermediate member is fixed axially, then the structure is simple, but torque fluctuations cannot be absorbed effectively
Solution Approach 1:
The patent introduces axial movability to the intermediate member, transforming it from a fixed component to a dynamic one that can shift position in response to torque fluctuations. This axial movement capability allows the intermediate member to absorb torque variations effectively, though it does increase structural complexity compared to a fixed design.
Solution Approach 2:
The intermediate member acts as a mediator between the torque transmission shaft and the outer member. By allowing this intermediate component to move axially, it serves as a buffer that absorbs torque fluctuations before they are transmitted further, effectively reducing the impact on the overall system despite the added complexity.
3Reliability
If only a single spring is used, then the structure is simple, but bidirectional torque fluctuations cannot be absorbed
Solution Approach 1:
The patent divides the spring system into multiple independent springs (first spring and second spring) that can operate independently in different directions. The first spring handles torque fluctuations in one direction while the second spring handles fluctuations in the opposite direction, enabling bidirectional absorption capability through segmentation of the damping function.
Solution Approach 2:
By using multiple springs with different characteristics, the system can change its mechanical properties to respond appropriately to torque fluctuations in different directions. Each spring is optimized for its specific directional function, allowing the system to adapt its stiffness and damping characteristics based on the direction of torque variation.
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
The system effectively absorbs bidirectional torque fluctuations, enhancing the efficiency and durability of vessel propulsion systems by mitigating mechanical stress and improving engine performance during acceleration and deceleration.
Implementation Method 1
The first spring biases the intermediate member in the first axial direction
Implementation Method 2
The second spring biases the intermediate member in the second axial direction
Implementation Method 3
The first inner helical spline is engaged with the first outer helical spline to provide a first helical spline coupling
Implementation Method 4
The second inner helical spline is engaged with the second outer helical spline to provide a second helical spline coupling
Data Source
AI summary
A torque fluctuation absorber includes a first outer helical spline, an intermediate member, an outer member, a first spring, and a second spring. The first outer helical spline is rotatable integrally with a torque transmission shaft. The intermediate member is able to move in a first axial direction and in a second axial direction. The intermediate member is linked with the torque transmission shaft through a first helical spline coupling including the first outer helical spline. Axial movement of the outer member with respect to the torque transmission shaft is regulated. The outer member is linked with the intermediate member through a second helical spline coupling. The first spring biases the intermediate member in the first axial direction. The second spring biases the intermediate member in the second axial direction.