Coolant Sleeve Fixing Device Using Press Plates
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Solution Overview
Problem
The existing methods for producing liquid coolant sleeves for electric motors are inefficient due to high material wastage, complex processing procedures, and stress concentration issues during fixation, leading to increased costs and reduced durability.
Innovation Solution
A split-type fixing device is introduced, featuring recesses on the liquid coolant sleeve and matching press plates that fit into these recesses, with linear contact to the housing, reducing stress concentration and simplifying the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lugs are produced at the end of the liquid coolant sleeve using an annular blank with larger wall thickness, then the liquid coolant sleeve can be fixed to the housing, but material wastage is high and processing costs increase
Solution Approach 1:
The fixing structure is segmented into multiple components: the liquid coolant sleeve body, separate lugs attached to the sleeve, and a fixing plate with corresponding through holes. This segmentation allows the lugs to be added only where needed rather than requiring the entire sleeve to be made from thick material, significantly reducing material wastage while maintaining fixing capability.
Solution Approach 2:
The lugs are preliminarily prepared as separate components and then attached to the liquid coolant sleeve before the final assembly with the housing. This preliminary action allows for optimized material usage in lug production without compromising the overall fixing strength, as the lugs are precisely positioned and secured during the assembly process.
2Reliability
If lugs are produced at the end of the liquid coolant sleeve, then fixing to the housing is enabled, but the processing procedure becomes complex and control requirements increase
Solution Approach 1:
By segmenting the fixing structure into separate components (sleeve, lugs, fixing plate), the processing procedure is simplified. Each component can be manufactured independently using standard processes, avoiding the need for complex machining operations on a single monolithic piece. The assembly process is straightforward, requiring only basic fastening operations.
Solution Approach 2:
The fixing plate serves multiple functions: it provides mounting holes for bolts, distributes mechanical stress across a larger area, and acts as a interface between the lugs and the housing. This multi-functionality reduces the need for additional specialized components, simplifying the overall processing procedure while maintaining fixing reliability.
3Reliability
If the liquid coolant sleeve is fixed directly to the housing using bolts, then the sleeve is secured, but stress concentration occurs at contact surfaces causing wear and damage
Solution Approach 1:
The fixing plate acts as a cushioning element between the lugs and the housing contact surfaces. It distributes the mechanical stress from the bolts over a larger area, preventing stress concentration at any single point. This beforehand cushioning protects the contact surfaces from wear and potential damage, enhancing the durability of the fixed assembly.
Solution Approach 2:
The introduction of the fixing plate changes the stress distribution parameters at the contact interface. Instead of concentrated point loads from direct lug-to-housing contact, the stress is distributed across the larger surface area of the fixing plate, reducing the pressure intensity and preventing material fatigue and wear.
Data Source
AI summary
A liquid coolant sleeve fixing device for fixing the cylindrical liquid coolant sleeve in a radially interior part of a housing is disclosed. The coolant sleeve fixing device includes a bolt for fixing the liquid coolant sleeve and the housing, and an axial installation hole disposed on an axial side of the housing and used for installing the bolt. The fixing device also includes a recess disposed on an axial side of the liquid coolant sleeve, and a press plate of a shape which fits the recess, the quantity of the press plate being the same as the quantity of the recess. A radially inner side part of the press plate presses against the interior of the recess. The press plate is fixed to the housing by means of the bolt and installation hole, thereby fixing the liquid coolant sleeve in the radially interior part of the housing.