Parallel Hybrid Driving Apparatus Generator Diameter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing driving apparatus for hybrid vehicles, where the engine and generator are arranged coaxially, limits the outer diameter of the generator, necessitating an increase in axial length to achieve necessary torque and power, thereby deteriorating loading capability and making the system bulky.
Innovation Solution
A driving apparatus design where the first motor is arranged in parallel to the engine's output shaft, allowing for a larger generator outer diameter without axial length increase, with the motor and generator supported by bearings and housed in cases to reduce size and improve loading capability, and a clutch unit positioned to optimize transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine and generator are arranged coaxially, then the outer diameter of the generator is limited by the engine merging plane, but increasing the axial length is required to obtain necessary torque and power
Solution Approach 1:
The patent changes the spatial arrangement from coaxial (same axis) to parallel (different axis), allowing the generator to increase its outer diameter in the radial direction without being constrained by the engine merging plane, thereby obtaining necessary torque and power without increasing axial length
2Power
If the generator and motor are arranged in parallel, then the outer shape becomes bulky in side view, but this arrangement allows for larger generator outer diameter
Solution Approach 1:
The patent nests the generator and motor concentrically, with the motor positioned inside or around the generator structure. This nested arrangement allows both components to share space efficiently, enabling the generator to have a larger outer diameter for required torque while minimizing the overall system volume
3Ease of manufacture
If the engine and generator are arranged coaxially, then the loading capability deteriorates due to increased axial length, but coaxial arrangement simplifies the power transmission system
Solution Approach 1:
The patent transitions from coaxial to parallel arrangement, changing the dimensional orientation of the power transmission system. This allows the system to achieve better loading capability by reducing axial length while maintaining manufacturing simplicity through standardized parallel mounting interfaces
Data Source
AI summary
A driving apparatus for a hybrid vehicle includes an engine shaft, a generator shaft and an idler shaft, which are arranged in parallel. The generator shaft includes at least an inner shaft and a hollow outer shaft which is attached rotatably relative to the inner shaft. The engine shaft connected to the crank shaft of an engine is engaged, through a generator driving gear, to the inner shaft which is coaxially provided with a generator. The outer shaft of the generator shaft which is coaxially provided with a motor is engaged to the idler shaft through a motor driving force transmission gear. The engine shaft and idler shaft are engaged to each other through an engine driving force transmission gear. The idler shaft and a differential device are engaged each other through a final gear. The differential device is connected to driving wheels, through a differential axles. The engine shaft has a clutch which serves to engage or disengage the power between the engine shaft and idler shaft through the engine driving force transmission gear.