Hybrid Power Train with Planetary Gear Mechanism
Solution Overview
Problem
Conventional hybrid power trains for vehicles lack the ability to efficiently utilize engine and motor torque characteristics across various driving modes, limiting driving efficiency and mileage.
Innovation Solution
A hybrid power train design featuring an input shaft, engine-side and motor-side drive gears, a one-way clutch, clutch unit, and planetary gear mechanism that allows for multiple gear stages in each driving mode by optimizing engine and motor torque utilization, including an electric power generation system for energy recovery and efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional hybrid power train uses a simple construction without planetary gear mechanism, then the device complexity is reduced, but the ability to realize multiple gear stages in each driving mode is limited
Solution Approach 1:
The planetary gear mechanism is nested within the existing hybrid power train structure, with the sun gear, planet gears, and ring gear arranged concentrically. This nested configuration allows multiple gear stages to be realized within a compact space without significantly increasing overall device complexity, thereby achieving both multiple gear stages and simple construction
2Use of energy by moving object
If the hybrid power train enters EV mode at low speeds using motor torque, then driving efficiency is improved, but the ability to provide high torque when required is limited
Solution Approach 1:
The clutch unit dynamically switches between EV mode and engine mode based on driving conditions. At low speeds, the clutch connects the motor to the output shaft for efficient EV operation. When high torque is required, the clutch engages the engine, and the planetary gear mechanism provides gear multiplication to deliver the necessary torque, thus dynamically adapting to different power requirements
3Force
If the hybrid power train enters engine mode at moderate or high speeds, then torque characteristics are improved, but the ability to utilize motor torque characteristics at low speeds is lost
Solution Approach 1:
The clutch unit serves multiple functions by being able to connect or disconnect different power sources (engine and motor) from the output shaft. This multi-functional component enables the hybrid power train to operate in EV mode at low speeds, engine mode at high speeds, and switch between modes as needed, thus achieving both good torque characteristics and driving mode flexibility
4Power
If the vehicle requires substantially high torque, then power output is improved, but the construction complexity increases to accommodate additional components
Solution Approach 1:
The planetary gear mechanism merges the engine power and motor power paths into a single integrated system. The sun gear, planet gears, and ring gear work together to multiply torque when needed, providing substantially high torque output without requiring separate complex transmission systems for different power sources, thus achieving high power with relatively simple construction
Data Source
AI summary
A hybrid power train for a vehicle may include an input shaft, an engine-side drive gear provided on the input shaft, an output shaft, an engine-side driven gear rotatably provided on the output shaft and meshed with the engine-side drive gear, a motor-side drive gear rotated by a motor, a motor-side driven gear fixedly provided on the output shaft and meshed with the motor-side drive gear, an output gear rotatably provided on the output shaft, a one way clutch installed between the output gear and the output shaft, a clutch unit provided to switch an operating state of the output gear and to switch an operating state of the engine-side driven gear between a fixed state and a released state relative to the output shaft, and a planetary gear mechanism installed to couple the output shaft and the output gear to each other.