Motor Cooling Jacket Cover for Venting and Drain Simplification

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Solution Overview

Problem

Existing motor designs with refrigerant flow paths require complex housing structures to accommodate air vent holes and drain holes for different stator lengths, complicating the design and reducing design flexibility.

Innovation Solution

A motor design featuring a cylindrical housing with a common first cover that includes both an air vent hole and a drain hole, simplifying the housing structure and allowing the same cover to be used across different housing lengths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If air vent holes and drain holes are provided in each housing having different lengths, then the motor can function properly with refrigerant cooling, but the housing structure becomes complicated

Engineering Contradiction:

Improverefrigerant cooling functionVSAvoidhousing structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The first cover is designed to serve multiple functions: it blocks the opening of the housing, provides an air vent hole for discharging air bubbles, provides a drain hole for draining refrigerant, and can also serve as a refrigerant supply port or discharge port. This multi-functional design allows the same cover structure to be used across housings of different lengths, eliminating the need for customized housings for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Manufacturing precision

If different housings are designed for different stator lengths, then each motor configuration can be optimized, but the degree of freedom in design is reduced

Engineering Contradiction:

Improvemotor configuration optimizationVSAvoiddesign flexibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The first cover is designed as a universal component that can be applied to housings of different lengths. By consolidating multiple functions (air venting, draining, refrigerant supply/discharge) into a single cover design, the patent enables designers to maintain optimized motor configurations for different stator lengths while preserving design flexibility and reducing the number of unique housing variants required.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This design simplifies the motor housing structure while maintaining functionality, allowing for a common cover to be used across various stator lengths, thereby enhancing design flexibility and reducing complexity.

Implementation Method 1

a refrigerant flow path for cooling a coil of a stator

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

a first cover that blocks an opening of the housing

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentEP4568076A1Motor comprising a cooling jacket

Publication Date: 2025.06.11 TOYOTA JIDOSHA KK

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AI summary

A motor (2; 102) includes a cylindrical housing (20) that accommodates a stator (4) and a rotor (3) inside, a first cover (10) and a second cover (30) that block each axial opening of the housing (20). The housing (20) is provided with a refrigerant flow path (21). The upper portion and the lower portion of the first cover (10) are provided with a first hole (13, 14) each through which an inside and an outside of the refrigerant flow path (21) communicate with each other.