Power Steering Connector Sealing to Prevent Fastener Loosening

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Solution Overview

Problem

The high cost of fixing bolts with locking functions in electric drive devices and electric power steering systems increases the unit price, affecting product competitiveness.

Innovation Solution

Incorporating an annular seal accommodating portion filled with liquid sealing agent and a guiding passage that allows the agent to flow to a fixing member, eliminating the need for expensive locking bolts by using the liquid sealing agent to secure the connector assembly and metal cover.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If fixing bolts with locking functions are used to secure the connector assembly, then the mechanical reliability is improved, but the unit price increases

Engineering Contradiction:
Improvemechanical reliabilityVSAvoidunit price
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive locking bolts with a liquid sealing agent that serves as both sealant and fixing material. The liquid sealing agent is applied in the annular seal accommodating portion and flows to the fixing member through the guiding passage, providing sufficient fixing strength without requiring additional locking mechanisms. This substitution of a cheap material for an expensive component directly reduces unit price while maintaining reliability

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The liquid sealing agent performs multiple functions simultaneously: it seals the gap between the metal cover and connector assembly to prevent liquid infiltration, and it also acts as the fixing material to secure the fixing member to the connector assembly. This multi-functionality eliminates the need for separate locking bolts, reducing component count and cost while maintaining mechanical reliability

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If the annular seal accommodating portion is filled with liquid sealing agent, then liquid tightness is ensured, but the complexity of assembly increases

Engineering Contradiction:
Improveliquid tightnessVSAvoidassembly complexity
Core Design Contradiction:
Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The liquid sealing agent is pre-filled in the annular seal accommodating portion before assembly, and the guiding passage is pre-formed to direct the flow of the agent. This preliminary preparation ensures that when the metal cover is assembled, the liquid sealing agent automatically flows to the fixing member through the guiding passage, providing both sealing and fixing functions without requiring complex post-assembly operations

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The liquid sealing agent serves itself by performing both sealing and fixing functions. The guiding passage enables the liquid sealing agent to automatically flow to the fixing member, eliminating the need for separate locking bolts or additional fixing operations. This self-service capability reduces assembly complexity while ensuring liquid tightness

Inventive Principle:
Principle #25Self-service

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 configuration prevents loosening of the fixing member and ensures liquid tightness, reducing the product's unit price while maintaining mechanical reliability.

Implementation Method 1

a liquid sealing agent guiding passage formed with the annular seal accommodating portion, and structured to allow the liquid sealing agent, which is filled in the annular seal accommodating portion, to flow to the fixing member

Methodology Applied
Scientific EffectFluid flow:

Implementation Method 2

an annular seal accommodating portion formed around an external terminal forming part of the connector assembly, and filled with a liquid sealing agent

Methodology Applied
Scientific EffectSealing:

Data Source

PatentUS11863045B2Electrically-operated drive device and electrically-operated power steering device
Publication Date: 2024.01.02 ASTEMO LTD
  • US11863045B2 patent drawing
  • US11863045B2 patent drawing
  • US11863045B2 patent drawing

AI summary

An electric power steering device includes a motor housing of an electric motor. An annular seal accommodating portion is formed around an external terminal forming part of a connector assembly, and filled with a liquid sealing agent. A fixing member fixes the connector assembly to a fixing part of an end face part of the motor housing. A liquid sealing agent guiding passage is formed with the annular seal accommodating portion, and allows the liquid sealing agent to flow to the fixing member. A metal cover includes: a bottom part including: an exposure hole through which the external terminal forming part is exposed to outside; and an annular reinforcing projecting portion formed at an edge of the exposure hole, and accommodated in the annular seal accommodating portion; and a lateral peripheral part angled from the bottom part, and forming an opening for fixation to the end face part.