Sequential Transmission Drum Assembly for Block-Out Gear Shifts
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Solution Overview
Problem
Automated sequential transmissions face challenges in smooth gear transitions due to block-out events, which can prevent vehicles from shifting from one gear position to another, leading to inefficient power delivery and potential vehicle immobilization.
Innovation Solution
The implementation of a shift fork system with concentric drums and a biasing member, where the second drum moves axially in response to a block-out event, allowing for smooth transitions between gear positions by recentering and re-engaging gears, and a hydraulic control unit positioned above the clutch to enhance responsiveness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional automated sequential transmission is used, then the transmission can shift between gears sequentially, but block-out events may prevent switching from one gear position to another, causing vehicle immobilization
Solution Approach 1:
The transmission system is divided into two independent drum mechanisms (first drum and second drum) that can operate separately. The second drum acts as a backup that can be engaged when the first drum encounters a block-out event, allowing gear transitions to proceed without complete system failure.
Solution Approach 2:
The system changes the operational state of the drums by adjusting their rotational positions. When a block-out event is detected, the control system modifies the rotational parameters of the second drum to recenter it and enable alternative gear engagement paths.
2Reliability
If the second drum is added to handle block-out events, then gear transition reliability improves, but the device complexity increases
Solution Approach 1:
The first drum and second drum are merged into a single integrated drum assembly where both drums share common structural support and control mechanisms. This consolidation reduces overall system complexity while maintaining the redundancy needed for reliable gear transitions.
Solution Approach 2:
The second drum is positioned concentrically within or adjacent to the first drum, creating a nested arrangement. This space-efficient configuration allows both drums to coexist in a compact package, minimizing the increase in device complexity while providing backup functionality.
3Speed
If the hydraulic control unit is positioned above the clutch, then responsiveness and stability are enhanced, but the manufacturing complexity increases
Solution Approach 1:
The hydraulic control unit serves multiple functions: it controls clutch engagement, monitors transmission fluid pressure, and provides feedback for gear position detection. This multi-functionality justifies the additional manufacturing complexity by consolidating several control functions into a single positioned component.
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 enables seamless gear shifting, improves vehicle responsiveness, and reduces the risk of immobilization by addressing block-out events and optimizing power delivery through enhanced mechanical and hydraulic control mechanisms.
Implementation Method 1
a biasing member, the biasing member biasing the second drum towards the first position
Implementation Method 2
a hydraulic control unit positioned above the clutch to enhance responsiveness and stability
Data Source
AI summary
A driveline assembly for a recreational vehicle may include an engine and an automated sequential transmission.