Planetary Transmission Layout for High-Ratio Compact Vehicle Gearboxes
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Solution Overview
Problem
Existing agricultural and industrial commercial vehicle transmissions require excessive installation space due to numerous shafts and gear sets, leading to insufficient gear ratios, high production costs, and complexity, which limits their operational efficiency and adaptability.
Innovation Solution
A transmission system with a primary transmission unit comprising multiple planetary gear sets and an intermediate gearbox, along with a reversing unit, to achieve a compact design with a high number of gear ratios, reducing installation space and complexity while improving efficiency and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional power shift transmissions are used, then torque transmission capability is achieved, but installation space requirement increases excessively
Solution Approach 1:
The patent combines multiple planetary gear sets (first, second, third planetary gear sets) into a single integrated transmission unit, merging their functions to achieve high torque transmission capability while reducing the overall installation space compared to traditional separate gear sets
Solution Approach 2:
The patent implements a nested structure where the second planetary gear set is positioned within the space defined by the first and third planetary gear sets, with the sun gear, planet gears, and ring gear arranged concentrically to maximize space utilization and reduce installation footprint
2Power
If numerous shafts and gear sets are used, then torque transmission is achieved, but device complexity increases
Solution Approach 1:
The patent merges multiple gear transmission functions into a single planetary gear set structure, where the sun gear, planet gears, and ring gear work together to provide multiple gear ratios, thereby reducing the number of separate shafts and gear sets needed in traditional transmissions
3Adaptability or versatility
If traditional transmission designs are used, then basic gear ratios are provided, but the number of gears in operating range is insufficient
Solution Approach 1:
The patent employs a dynamic transmission system where the first, second, and third planetary gear sets can be selectively engaged or disengaged through clutch mechanisms, allowing the transmission to dynamically adjust the number of available gear ratios in the operating range without permanently increasing installation space for all possible gears
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 transmission system provides a compact, efficient, and adaptable solution with a high number of gear ratios, reducing installation space, production costs, and improving the operational efficiency and roadworthiness of commercial vehicles.
Implementation Method 1
The primary transmission unit comprises at least one first planetary gear set having a first sun gear, a first ring gear, a first planet carrier, and a first planet set, a second planetary gear set, and a third planetary gear set
Data Source
AI summary
A transmission includes a drive element, a first output element, a primary transmission unit, a reversing unit, and an intermediate gearbox. At least three of the at least eight shifting elements of the primary transmission unit, at least one of the at least two shifting elements of the reversing unit, and at least one of the at least two shifting elements of the intermediate gearbox are activatable in combinations of at least five shifting elements so as to establish at least twenty-eight forward gears between the drive element and the first output element.