Multi-Shaft Gearbox Layout for More Gear Ratios in Less Space
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Solution Overview
Problem
Conventional vehicle gearboxes are limited by the number of gears they can physically accommodate, leading to size and weight constraints, and complex, expensive designs that are difficult to maintain when trying to increase gear options.
Innovation Solution
A remotely controlled gearbox apparatus with a novel arrangement of parallel shafts and gear wheels, allowing users to wirelessly select and multiply gear speeds via a smartphone or similar device, effectively increasing the number of available gears beyond physical limitations, reducing stress on the drive shaft and minimizing gearbox size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of gears is increased to provide more gear speeds, then the versatility of the gearbox is improved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The gearbox is divided into multiple independent shafts (input shaft, intermediate shafts, output shaft) with gear sets mounted on each. This segmentation allows the gearbox to achieve multiple gear ratios through different combinations of gear engagements rather than requiring a single complex gear train, thereby reducing overall structural complexity while maintaining versatility.
Solution Approach 2:
The gear sets mounted on intermediate shafts serve multiple functions: they can be engaged with different input gears and drive different output gears simultaneously. This multi-functionality allows a limited number of physical gears to produce a multiplied number of gear ratios, resolving the contradiction between versatility and complexity.
2Adaptability or versatility
If the number of gears is increased to provide more gear speeds, then the versatility of the gearbox is improved, but the size and weight of the gearbox increase
Solution Approach 1:
By segmenting the gear transmission into multiple shafts with fewer gears each, the overall gearbox size and weight are reduced compared to a single-stage gearbox with many gears. Each shaft carries only the gear sets necessary for its specific function, minimizing material usage and weight.
Solution Approach 2:
The patent arranges gear sets in a multi-dimensional configuration across parallel shafts rather than stacking them in a single linear sequence. This spatial arrangement allows for compact packaging of multiple gear ratios without proportionally increasing gearbox volume or weight, as gears on different shafts can share common mounting spaces and support structures.
3Adaptability or versatility
If the number of gears is increased to provide more gear speeds, then the versatility of the gearbox is improved, but the manufacturing cost and difficulty of maintenance increase
Solution Approach 1:
The modular shaft-and-gear-set design allows for standardized manufacturing of individual gear sets that can be produced independently and then assembled. This segmentation enables economies of scale in manufacturing common gear components across different gear ratios, reducing per-unit manufacturing cost compared to custom-machining each gear in a complex single-stage design.
Solution Approach 2:
The gear sets on intermediate shafts are designed with universal mounting and engagement features that allow the same physical gear to participate in multiple gear ratio combinations. This universality reduces the total number of unique gear components that need to be manufactured, thereby lowering manufacturing costs while maintaining a high number of available gear speeds.
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
Enables users to access a greater range of gear speeds and rotational power, reducing physical stress on the drive shaft and minimizing gearbox size, while allowing easy wireless selection and management of gear options.
Implementation Method 1
first and second input gear wheels connected to the input shaft for axial rotation therewith; a first controlling gear set having two or more first controlling gear wheels mounted on the responding shaft for axial rotation therewith
Data Source
AI summary
A gearbox apparatus includes a number of gears selectable by a user to drive a drive shaft, the number being greater than the number of gears physically connected to the drive shaft of the gearbox. The apparatus can be controlled remotely by a wireless signal emitting or receiving device, which includes a smart phone, desktop computer, a signal tower, and the like.