Rotary Electric Machine Rotor Core Retaining Plate
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Solution Overview
Problem
The existing rotary electric machines for hybrid vehicle driving apparatuses face productivity issues due to the thick boss portions, which are primarily manufactured through casting and require extensive cutting work.
Innovation Solution
The rotary electric machine incorporates a rotor core retaining portion and a torque transmitting portion, both formed as plate-shaped members, allowing for press working and improving productivity in the formation of the boss portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the boss portion is manufactured by casting from a member having a large thickness, then the boss portion can bear large torque, but cutting work is mainly required which leads to poor productivity
Solution Approach 1:
The boss portion is divided into multiple thin-walled cylindrical portions (first through fourth cylindrical portions) with different wall thicknesses, each optimized for specific functions. This segmentation allows each portion to be formed by efficient press working rather than requiring extensive cutting of a thick cast component, thereby improving productivity while maintaining torque bearing capacity through strategic thickness distribution.
Solution Approach 2:
The invention changes the manufacturing method from casting to press working, and transforms the boss portion structure from a single thick-walled component to multiple thin-walled cylindrical portions with varying wall thicknesses. This parameter change enables more efficient manufacturing with reduced cutting work while maintaining structural integrity and torque transmission capability.
2Strength
If the boss portion is manufactured by casting, then it can provide sufficient strength, but the manufacturing process is complex and time-consuming
Solution Approach 1:
The boss portion is segmented into multiple cylindrical portions that can be efficiently formed by press working. This segmentation transforms a complex casting process into a more straightforward forming process, improving ease of manufacture while maintaining structural strength through the multi-layered cylindrical structure with optimized wall thicknesses.
Solution Approach 2:
The invention changes the manufacturing approach from casting to press working of thin-walled cylindrical portions. This parameter change simplifies the manufacturing process by eliminating the complexity of casting thick sections and subsequent extensive machining, making the boss portion easier to manufacture while preserving structural integrity.
Data Source
AI summary
According to the present invention, provided is a rotary electric machine, which is to be connected to at least one of a first torque input/output shaft and a second torque input/output shaft, and includes a stator and a rotor. The rotor of the rotary electric machine includes: a rotor core; a torque transmitting portion, which is connected to at least one of the first torque input/output shaft and the second torque input/output shaft, and is formed of a plate-shaped member; and a rotor core retaining portion, which is retained on the torque transmitting portion, is configured to retain the rotor core, and is formed of a plate-shaped member.