Vehicle Door Trim Position Restricting Member
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Solution Overview
Problem
Conventional methods for mounting shock absorbing members to vehicle door trims result in positional fluctuations due to manufacturing tolerances, leading to deformation and rattling of the door trim.
Innovation Solution
Incorporating a position restricting member, such as a washer attached to a mounting boss, to restrict the position of the shock absorbing member in the vehicle width direction relative to the door trim body, thereby adjusting the positional relationship and preventing interference and rattling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a shock absorbing member made from foamed material is used to absorb impact load, then the shock absorbing function is improved, but manufacturing tolerance increases causing positional fluctuation and deformation
Solution Approach 1:
A position restricting member (such as a position restricting rib or guide structure) is introduced as an intermediary element between the shock absorbing member and the door trim body. This mediator component compensates for the large manufacturing tolerance of the foamed material by mechanically constraining the position of the shock absorbing member, thereby preventing deformation and rattling while maintaining the shock absorbing function.
2Reliability
If the shock absorbing member is pressed toward the door trim during mounting, then the fastening is secured, but positional fluctuation causes deformation and rattling of the door trim
Solution Approach 1:
The position restricting member is designed to establish the correct position of the shock absorbing member before the final pressing operation. By pre-constraining the position in the vehicle width direction, the subsequent pressing action to secure fastening does not cause positional fluctuation, thereby preventing deformation and rattling of the door trim while maintaining reliable fastening.
3Ease of manufacture
If manufacturing tolerance of the shock absorbing member is large to accommodate material variations, then ease of manufacture is improved, but positioning accuracy deteriorates causing interference and rattling
Solution Approach 1:
The position restricting member serves as a mediator that decouples the manufacturing tolerance issue from the final positioning accuracy. It allows the shock absorbing member to be manufactured with larger tolerance using foamed materials for ease of manufacture, while the position restricting member ensures accurate positioning during assembly, preventing interference and rattling.
Data Source
AI summary
A door trim for a vehicle to be mounted to a door panel of the vehicle is provided. This door trim includes a door trim body and a mounting part to which a shock absorbing member for absorbing an impact load between the door panel and the door trim is mounted. The mounting part has a position restricting member for restricting the position of the shock absorbing member in the vehicle width direction relative to the door trim body.