Steering Gear Housing Bolt Guide for Stable Thread Engagement
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Solution Overview
Problem
The existing steering device technology faces issues where the bolt inserted into the insulator for fixing the gear housing to the vehicle body tends to thrust and spin due to relative inclination, leading to poor engagement of the bolt's external thread with the internal thread, causing instability in the fastening process.
Innovation Solution
A reduced diameter portion is formed in the inner periphery of the cylindrical body of the core metal, located anterior to the internal thread portion in the bolt-inserting direction, which guides the bolt and restricts its inclination, ensuring proper engagement and preventing thrusting against the insulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bolt is inserted into the insulator for fixing the gear housing, then the fastening function is achieved, but the bolt thrusts and spins due to relative inclination causing poor thread engagement
Solution Approach 1:
The guide portion is formed in advance on the inner peripheral surface of the insulator's cylindrical body, before the bolt insertion process. This guide portion preliminarily establishes the correct insertion path and angular orientation, ensuring that when the bolt is inserted, it automatically follows the intended trajectory and achieves proper thread engagement without thrusting or spinning.
Solution Approach 2:
The guide portion acts as an intermediary element between the bolt and the insulator's internal thread portion. It mediates the insertion process by providing a transitional surface that guides the bolt's approach, ensuring smooth engagement and preventing direct contact between the bolt's distal end and the internal thread portion that would cause thrusting and spinning.
2Speed
If the bolt is inserted without guidance, then insertion speed is maintained, but the bolt inclines relative to the insulator causing thrusting and spinning
Solution Approach 1:
The guide portion changes the geometric parameters of the insertion path by providing a tapered or angled surface that gradually directs the bolt into the correct orientation. This gradual parameter change allows the bolt to transition from a parallel approach to the correct insertion angle smoothly, maintaining insertion speed while preventing inclination and thrusting.
Data Source
AI summary
In an insulator inserted in an insulator accommodation hole of a bracket body portion, an inclined portion is formed in an inner periphery of a first cylindrical body portion of a first core metal, the inclined portion being provided anterior to an internal thread portion in an inserting direction of a bolt and reduced in diameter toward the rear side in the inserting direction.