Motorcycle Resin Part Attachment Guide Piece
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional attachment structures for resin parts on motorcycles, using shoulder bolts, often require corrective alignment due to the large diameter portion of the bolt abutting the seating surface of the bolt insertion hole, leading to inefficient assembly and increased manufacturing effort.
Innovation Solution
An attachment structure for resin parts with a bolt insertion hole featuring a thin guide piece on its inner circumference, guiding the shoulder bolt's large diameter portion into the hole without abutment, and allowing for secure fastening and sealing, while being easily formed during resin molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a shoulder bolt is used for attaching resin parts, then the fastening pressure can be controlled, but the large diameter portion abuts the seating surface causing assembly difficulty
Solution Approach 1:
A guide piece is introduced as an intermediary element between the large diameter portion and the seating surface. The guide piece has a through-hole that guides the large diameter portion during insertion, preventing direct abutment with the seating surface. This mediator enables smooth assembly while maintaining the fastening function of the shoulder bolt.
Solution Approach 2:
The guide piece extends in the axial direction (length dimension) rather than just radially, creating a tunnel-like structure that guides the bolt from a distance. This dimensional approach allows the large diameter portion to be guided along the axial path into the resin part without contacting the seating surface.
2Strength
If a metal collar is insert-molded into the resin part, then fastening pressure can be controlled, but manufacturing complexity increases
Solution Approach 1:
The guide piece is extracted from the metal collar component and integrated directly into the resin part structure. Instead of using a separate metal collar that requires insert-molding, the guide piece is formed as part of the resin molding process, simplifying manufacturing while maintaining the same functional effect of guiding the shoulder bolt.
Solution Approach 2:
The guide piece and resin part are merged into a single integrated component. The guide piece is molded together with the resin part in one manufacturing process, eliminating the need for separate metal collar production and insert-molding operations, thereby reducing manufacturing complexity.
3Length of moving object
If the bolt insertion hole diameter is larger than the threaded shaft portion, then the large diameter portion can be inserted, but position correction is required during assembly
Solution Approach 1:
The guide piece performs preliminary alignment action before the large diameter portion reaches the seating surface. By providing a guided path through the through-hole, the bolt is pre-positioned correctly as it approaches, eliminating the need for manual position correction during the final assembly stage.
Data Source
AI summary
An attachment structure for a resin part of a motorcycle includes an attaching portion with a nut provided on a side of a vehicle main body, a resin part having an attached portion with a bolt insertion hole, and a shoulder bolt for attaching the attached portion to the attaching portion with the nut. The shoulder bolt has a threaded shaft portion, a washer, a head portion, and a large diameter portion arranged between the washer and the threaded shaft portion, the large diameter portion being thicker than the threaded shaft portion and thinner than the washer. A thin guide piece protruding toward a radially inner side for regulating radial movement of the shoulder bolt within a predetermined range is integrally formed on an inner circumferential surface of the bolt insertion hole. The guide piece is configured to be deformed by the large diameter portion of the shoulder bolt.