Shift Drum Transmission Blocking Under Adverse Torque Conditions
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Solution Overview
Problem
Existing transmission systems face issues with pre-selected gear shifts leading to engine over-speed, particularly in manually operated gearboxes, due to inadequate blocking mechanisms during torque changes.
Innovation Solution
A transmission system with a shaft and drum configuration that includes a biasing mechanism and drive member selector, allowing selective engagement for gear ratio changes while blocking rotation in adverse torque conditions, ensuring safe transitions between gear ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-selection of gear is allowed in manually operated gearbox, then ease of operation is improved, but engine over-speed occurs due to inadequate blocking mechanisms
Solution Approach 1:
The patent applies preliminary anti-action by implementing blocking features that prevent unwanted gear shifts before they can occur. The blocking features are positioned to engage with the shaft and drum configuration, creating a preventive mechanism that stops pre-selected gear shifts from causing engine over-speed, thus addressing the reliability issue while maintaining ease of operation.
Solution Approach 2:
The patent uses an intermediary mechanism in the form of a drum that can be moved along the shaft. This drum acts as a mediator between the shaft rotation and the gear selection, allowing the blocking features to control gear shifts indirectly. The drum's movement along the shaft enables the blocking mechanism to engage or disengage based on torque conditions, resolving the contradiction between ease of operation and reliability.
2Reliability
If blocking mechanism is added to prevent engine over-speed, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the blocking mechanism with the existing shaft and drum configuration. The blocking features are integrated into the drum and shaft assembly rather than being separate components, which reduces overall device complexity while maintaining reliability. The drum's dual function of enabling gear selection and providing blocking capability exemplifies this merging principle.
Solution Approach 2:
The drum serves multiple functions: it enables gear selection through rotation, provides blocking capability through its movement along the shaft, and facilitates torque transfer. This multi-functionality reduces the need for separate blocking components, thereby improving reliability without significantly increasing device complexity.
3Adaptability or versatility
If drum is moved along shaft for gear selection, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the gear selection process into discrete positions along the shaft, with the drum able to stop at specific locations corresponding to different gear ratios. This segmentation allows for standardized manufacturing of the shaft and drum with defined stop positions, reducing manufacturing precision requirements while maintaining adaptability for multiple gear selections.
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 prevents unwanted gear shifts during negative or positive torque conditions, thereby preventing engine over-speed and ensuring smooth transitions when torque conditions are reversed.
Implementation Method 1
a biasing mechanism for urging the drum towards a rest position along the length of the shaft
Data Source
AI summary
Some embodiments are directed toward a transmission having a torque input and output, drive members selectively engageable for sequentially changing gear ratio between the torque input and output, the transmission also having a shaft with a shifting feature. The transmission includes a drum having a track around its outer perimeter and arranged such that torque can be transferred by rotating the shaft, the drum capable of being moved along the length of the shaft, a biasing mechanism for urging the drum towards a rest position along the length of the shaft, and a drive member selector member provided in operative relation to the track, wherein by rotating the shaft the drive member selector member can be selectively urged into contact with a first drive member for drivingly engaging therewith in a first torque connection or into contact with a second drive member for drivingly engaging in a second torque connection.