Torque Split Automatic Transmission Design
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Solution Overview
Problem
Conventional automatic transmissions face challenges in increasing torque delivery capacity without compromising fuel efficiency and installability due to the need for stronger axles and more friction members, which leads to increased weight and size, and requires significant design changes and development costs.
Innovation Solution
A torque split type automatic transmission system that divides engine torque into two paths, using a single pinion planetary gear set and a torque converter for the first path, and a multiple-shift transmission device for the second path, allowing for increased torque delivery with reduced component size and weight by distributing torque through two power delivery paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the strength of the axle is strengthened to increase torque delivery capacity, then torque delivery capacity is improved, but weight of the axle is increased
Solution Approach 1:
The power delivery system is segmented into two separate paths: a first power delivery path through a torque converter and a second power delivery path directly from the planetary gear set. This segmentation allows torque to be distributed across multiple routes, reducing the torque burden on any single component including the axle, thereby maintaining torque delivery capacity without requiring excessive axle strength and weight.
Solution Approach 2:
The invention transitions from a single-dimensional power delivery path to a two-dimensional power delivery system with parallel paths. By adding the dimension of multiple power delivery routes, the system achieves enhanced torque delivery capacity without proportionally increasing axle weight, as the torque is distributed across different dimensional pathways rather than concentrated on one overloaded path.
2Strength
If the number of friction members is increased to increase torque delivery capacity, then torque delivery capacity is improved, but size of the transmission is increased
Solution Approach 1:
The transmission system is segmented into two parallel power delivery paths, distributing the torque transmission function across multiple routes. This segmentation reduces the torque burden on individual friction members and transmission components, allowing for a more compact transmission design that achieves high torque delivery capacity without requiring an excessive number of friction members or increased transmission size.
Solution Approach 2:
The invention merges the torque converter function with the planetary gear set in an integrated torque split type automatic transmission. By combining these components into a unified system with dual power delivery paths, the design achieves enhanced torque delivery capacity without proportionally increasing the number of friction members or overall transmission size, as the merged structure shares common components between the two paths.
3Strength
If design of the launching device is changed to increase torque capacity, then torque capacity is improved, but development cost and time are increased
Solution Approach 1:
The planetary gear set is designed to serve multiple functions: it acts as both a torque splitting device and a transmission device, and serves as both the first and second power delivery paths. This multi-functionality allows the same component to enhance torque capacity across both power delivery paths without requiring separate dedicated components, thereby reducing development time and cost while achieving improved torque capacity.
Solution Approach 2:
The invention merges the torque split device and transmission device into a single integrated planetary gear set. By combining these functions into one universal component, the design achieves enhanced torque capacity without requiring separate design and development efforts for multiple dedicated components, thereby reducing development time and cost while maintaining improved torque performance.
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
This approach enables increased torque delivery capacity with reduced size and weight of components, improving fuel efficiency and installability, while minimizing design changes and development costs by using a torque split device and multiple-shift transmission device.
Implementation Method 1
a torque converter which is a launching device 111... The torque increased in the torque converter which is the launching device 111 is added to the torque transmitted from the torque split device 110 to the transmission device 112
Data Source
AI summary
A torque split type automatic transmission which transmits the torque output from an engine through two paths, adds the torque passing through and increased in each path, and outputs a final torque, wherein the torque of the engine is divided into two portions by a torque split device and each portion of the torque is transmitted respectively to first and second power delivery paths and wherein the first power delivery path is connected to a launching device, the second power delivery path is connected to a transmission device, and outputs of the launching device and the transmission device meet such that the torques increased at each power delivery path is added to each other and the final torque is output.