Binary Gearbox Using Cascading Selectors for Speed Range
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Solution Overview
Problem
Conventional gearboxes require multiple gears and selectors to achieve a limited number of discreet selectable speeds, leading to increased weight and reduced fuel efficiency, as they need to operate within a specific engine rpm range.
Innovation Solution
A gearbox configuration with cascading gear pairs and selectors, where the gear ratio of selected pairs is multiplied through additional gear pairs, allowing for a greater number of output speeds without adding physical gears or selectors, achieved by using multiple gear pairs and selectors to create an aggregate gear ratio through output shafts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple gear pairs and selectors are added to increase the number of selectable speeds, then the number of output speeds increases, but the weight of the gearbox increases
Solution Approach 1:
Each selector in the binary gearbox is designed to perform multiple functions: it selects between two different gear pairs while also enabling different combinations with other selectors to create unique aggregate gear ratios. The selectors work together in a binary system where each selector represents a bit in the gear selection code, allowing one selector to contribute to multiple different final gear ratios when combined with others.
Solution Approach 2:
The system changes the parameter of gear ratio selection by using binary coding of selector positions. Instead of requiring a separate selector for each gear ratio, the system uses the positional states of fewer selectors (representing binary values) to define which gear pairs are engaged, thereby changing the aggregate gear ratio through parameter combinations rather than physical multiplication of components.
2Adaptability or versatility
If multiple gear pairs and selectors are added to achieve more discreet selectable speeds, then the number of output speeds increases, but the device complexity increases
Solution Approach 1:
The gearbox is segmented into multiple independent gear pairs, each providing a specific gear ratio. The selection process is segmented into binary decisions at each selector position, where each selector independently chooses between two gear pairs. This segmentation allows the system to achieve multiple gear ratios through simple binary combinations rather than complex interdependent mechanisms.
Solution Approach 2:
Instead of using a conventional approach where each selector directly selects one gear from a sequence, the binary gearbox inverts the logic by using selectors that choose between pairs of gears based on binary state combinations. The gear selection is determined by the inverted conventional wisdom: rather than linear progression through gear selections, the system uses binary state combinations of selectors to define gear pair engagements, simplifying the control architecture.
3Speed
If the engine operates outside the optimal rpm range, then the vehicle can achieve a wider speed range, but the fuel efficiency decreases
Solution Approach 1:
The binary gearbox provides dynamically selectable gear ratios that allow the engine to operate within its optimal rpm range across varying vehicle speeds. The system enables real-time adjustment of the aggregate gear ratio by changing which gear pairs are engaged, creating a dynamic transmission system that adapts to maintain optimal engine operating conditions while achieving the desired vehicle speed range.
Data Source
AI summary
A gearbox comprises a plurality of gear pairs each having a specific gear ratio, and a plurality of selectors each mounted between two gear pairs for selecting one of the two gear pairs, wherein the gear ratio of the selected gear pair is cascaded through an output shaft to another two gear pairs having another selector, and so on. In this way, the effective or aggregate gear ratio of the gearbox is the product of the gear ratios of the selected gear pairs. Thus, the number of available output speeds excluding neutral is given by 2n, where n=(number of gear pairs)/2.