Hybrid Powertrain Planetary Gear Multi-Staging
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Solution Overview
Problem
Hybrid vehicles require additional transmission components to maintain high speed and secure low-speed torque, increasing complexity, cost, and weight, while existing power branch methods lack efficient multi-staging for improved driving performance.
Innovation Solution
A powertrain configuration incorporating multiple planetary gear sets with friction members and motor generators allows for selective input/output elements and multi-staging of shift stages, enabling improved EV driving performance and reducing motor capacity and weight by integrating a dry clutch, dog clutch, and synchromesh type synchronizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission components are added to maintain high speed and secure low-speed torque, then driving performance is improved, but device complexity and cost increase
Solution Approach 1:
The planetary gear set is designed to perform multiple functions: it provides both high-speed and low-speed torque capabilities through different engagement configurations of the friction members. The first and second friction members can selectively engage different elements (sun gear, ring gear, carrier) to achieve various gear ratios, eliminating the need for separate transmission components for different driving conditions.
Solution Approach 2:
The patent combines the functions of multiple transmission stages into a single integrated planetary gear set. By merging the high-speed and low-speed torque delivery mechanisms into one compact unit with selective engagement capabilities, the design reduces overall device complexity while maintaining comprehensive driving performance across different speed ranges.
2Productivity
If transmission components are added to maintain high speed and secure low-speed torque, then driving performance is improved, but cost increases
Solution Approach 1:
The planetary gear set serves as a universal component that handles both high-speed and low-speed torque requirements, eliminating the need for multiple specialized transmission components. This multi-functionality reduces manufacturing costs by consolidating what would otherwise require separate expensive transmission systems into a single integrated unit.
3Productivity
If motor capacity is increased to improve EV driving performance, then driving performance is improved, but weight increases
Solution Approach 1:
The planetary gear set enables parameter changes in torque delivery by providing different gear ratios through selective engagement of friction members. This allows the motor to operate at optimal parameters for EV driving performance while the gear set transforms the output to meet various driving conditions, effectively decoupling motor size from performance requirements and reducing motor weight.
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 configuration enhances driving performance by enabling multi-staged shift stages, reduces motor costs and weight, and improves fuel efficiency by optimizing power flow between engine and electric motor, particularly in EV and EVT modes.
Implementation Method 1
a second rotation element intermittently connected to the first motor through a first friction member
Implementation Method 2
a dog clutch that is able to be selectively fastened between a transmission case and the third rotation element
Implementation Method 3
a first planetary gear set including a first rotation element connected to a first motor to be operated as an input element, a second rotation element intermittently connected to the first motor through a first friction member and connected to an output shaft to be operated as a selective input element or a selective output element, and a third rotation element operated as a selective fixing element
Data Source
AI summary
A powertrain for a hybrid vehicle may include a first planetary gear set including a first rotation element connected to a first motor to be operated as an input element, a second rotation element intermittently connected to the first motor through a first friction member and connected to an output shaft to be operated as a selective input element or a selective output element, and a third rotation element operated as a selective fixing element by a second friction member.