Transmission Interlock Pivot Arm for Smooth Gear Shift Locking
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Solution Overview
Problem
Existing transmission systems with a combination of slidable and pivotable shift forks face challenges in preventing simultaneous engagement of gears, which can lead to friction and inefficient gear shifting, particularly when pivotable shift forks are used more frequently.
Innovation Solution
An interlocking device with a pivot arm that automatically prepositions itself to prevent simultaneous engagement of gears by allowing relative movement of either the pivotable or slidable shift fork, utilizing a biasing member like a torsion spring to facilitate smooth and low-friction gear shifting, while preventing simultaneous engagement of gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an interlocking device mechanically locks one shift fork when the other engages a gear, then simultaneous gear engagement is prevented, but friction increases and gear shifting becomes less efficient
Solution Approach 1:
The pivot arm is designed to dynamically change position between a first position (when second gear is engaged) and a second position (when first gear is engaged), allowing the interlocking mechanism to adapt its locking behavior based on the current gear state, thereby reducing unnecessary friction on the frequently used pivotable shift fork
Solution Approach 2:
The biasing member automatically prepositions the pivot arm in the second position before gear shifting occurs, ensuring the pivotable shift fork is unlocked and ready for smooth engagement, eliminating the need for manual intervention and reducing initial friction during the shifting operation
2Reliability
If the pivot arm is locked in a fixed position to prevent simultaneous engagement, then gear engagement safety is ensured, but the pivotable shift fork experiences increased friction and slower shifting speed
Solution Approach 1:
The pivot arm transitions between fixed positions (first and second positions) based on gear engagement state, dynamically adjusting the interlocking behavior to allow rapid pivoting motion of the shift fork when needed, thereby increasing gear shifting speed while maintaining safety
Solution Approach 2:
The biasing member prepositions the pivot arm in advance in the second position, preparing the interlocking device for upcoming gear shifts, which eliminates delays and enables faster gear shifting operations
3Ease of operation
If the pivot arm is manually positioned to allow pivotable shift fork movement, then gear shifting efficiency improves, but the risk of simultaneous engagement increases without automatic control
Solution Approach 1:
The biasing member automatically positions the pivot arm without manual intervention, making the interlocking device self-regulating based on the engagement state of the slidable shift fork, thereby maintaining both ease of operation and reliability simultaneously
Solution Approach 2:
The interlocking device uses the engagement state of the slidable second shift fork as feedback to automatically adjust the pivot arm position through the biasing member, ensuring the pivotable first shift fork is appropriately locked or unlocked, thereby preventing simultaneous engagement while maintaining smooth operation
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 interlocking device ensures efficient prevention of simultaneous gear engagement, reduces friction, and enables faster gear shifting by automatically positioning the pivot arm, thereby optimizing the use of pivotable shift forks and maintaining smooth operation even in heavy-duty vehicles.
Implementation Method 1
utilizing a biasing member like a torsion spring to facilitate smooth and low-friction gear shifting
Implementation Method 2
utilizing a biasing member like a torsion spring to facilitate smooth and low-friction gear shifting
Data Source
AI summary
An interlocking device for a transmission is provided, where the transmission includes a pivotable first shift fork for selectively engaging a first gear and a slidable second shift fork for selectively engaging a second gear. The interlocking device includes a pivot arm pivotable between a first position and a second position, and having a first end and a second end. The first end includes a first interacting portion that interacts with a first locking member of the first shift fork. The second end includes a second interacting portion that interacts with a second locking member of the second shift fork. In the first position, pivoting movement of the first shift fork is prevented and relative sliding movement of the second shift fork is allowed, and in the second position, relative pivoting movement of the first shift fork is allowed and relative sliding movement of the second shift fork may be prevented.