Integrated Starter Generator with Shared Shaft for Hybrid Vehicles
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Solution Overview
Problem
Conventional hybrid vehicles require a large installation space and complex assembly due to separate starter motors and electric oil pumps, which are necessary for starting the engine and supplying hydraulic oil to the transmission.
Innovation Solution
An integrated starter generator with a shared rotating shaft for both the starter motor and electric oil pump, where the starter motor includes a drive part, selective engaging part, and engagement drive part, allowing the electric oil pump to supply hydraulic oil to the transmission while reducing space and enhancing assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate starter motor and electric oil pump are used, then starting function and hydraulic oil supply function are achieved, but installation space increases and assembly complexity increases
Solution Approach 1:
The patent combines the starter motor and electric oil pump into a single integrated unit that shares a common rotating shaft. The starter motor includes a drive part, selective engaging part, and engagement drive part, while the electric oil pump is coupled to the same rotating shaft, allowing both functions to be achieved within a compact space, thereby reducing installation area while maintaining full functionality.
Solution Approach 2:
The rotating shaft serves multiple functions: it drives both the starter motor for engine starting and the electric oil pump for hydraulic oil supply. This multi-functional design allows a single component to perform what previously required two separate components, reducing space requirements while maintaining adaptability for both starting and hydraulic functions.
2Adaptability or versatility
If separate starter motor and electric oil pump are used, then starting function and hydraulic oil supply function are achieved, but assembly complexity increases
Solution Approach 1:
The patent integrates the starter motor and electric oil pump into a single assembly unit that shares a common rotating shaft and housing structure. This merging reduces the number of separate components that need to be assembled, simplified the assembly process, and reduced manufacturing complexity while maintaining both starting and hydraulic oil supply functions.
3Area of stationary object
If integrated starter generator is used, then space requirements are reduced and assembly is simplified, but functional reliability must be maintained
Solution Approach 1:
The integrated starter motor is divided into distinct functional modules: a drive part for generating rotational force, a selective engaging part with pinion and ring gear for controlled engagement, and an engagement drive part for actuating the engagement mechanism. This segmentation allows each module to be optimized for its specific function while maintaining overall reliability through modular design that facilitates maintenance and reduces failure propagation.
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 integrated solution reduces space requirements and simplifies assembly by combining the starter motor and electric oil pump functions, enabling efficient hydraulic oil supply and improved fuel efficiency by preventing unnecessary fuel injection during idle engine operation.
Implementation Method 1
a starter motor which moves the crank shaft when the engine is started
Implementation Method 2
an electric oil pump to supply hydraulic oil to a transmission
Implementation Method 3
A belt operates a pulley installed at each of a crank shaft of the engine, an output shaft of the auxiliary machine, and an output shaft of the integrated starter generator
Data Source
AI summary
The present invention provides a hybrid vehicle, which has both the function of supplying hydraulic oil to a transmission when the idle operation of an engine is stopped, and the function of providing start force when the engine is cold started, thus reducing space occupied by components, and enhancing assembling productivity due to modularized components.