Brake Disc Fastening Structure With Bolt Head Recess
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Solution Overview
Problem
Conventional brake disc fastening structures in saddle seat type vehicles reduce the flexibility of layout for other parts on the lateral outer side due to the projection of bolt heads outside the collar, limiting space utilization and interference with other components.
Innovation Solution
A brake disc fastening structure featuring a collar with a cylindrical portion and a flange portion, where a spring member is interposed between the flange and the brake disc, and a bolt head accommodating recess is formed at the collar's inner end to house the bolt head, allowing the bolt to be screwed from the outer side and ensuring the head does not project, thus optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bolt head projects outside the collar, then the fastening structure is simple, but the flexibility to layout other parts on the laterally outer side of the brake disc is reduced
Solution Approach 1:
The collar is designed with a hollow cylindrical portion that receives and accommodates the bolt head inside its cavity. This nesting arrangement allows the bolt head to be contained within the collar structure rather than projecting outward, thereby resolving the contradiction by maintaining structural simplicity while freeing up lateral space for other component layouts.
Solution Approach 2:
Instead of allowing the bolt head to extend in the lateral dimension (radial direction from the wheel), the collar redirects the bolt head accommodation into the axial dimension (along the bolt length). The hollow cylindrical portion provides axial depth to contain the bolt head, effectively moving the problem from a lateral space issue to an axial dimension solution.
2Adaptability or versatility
If the bolt head is accommodated within the collar, then the flexibility to layout other parts is improved, but the collar structure becomes more complex
Solution Approach 1:
The collar is designed to perform multiple functions simultaneously: it fastens the brake disc to the wheel, provides a mounting surface for the spring member, and accommodates the bolt head within its hollow cylindrical portion. By integrating these functions into a single component, the collar structure achieves the required complexity only to the extent necessary, rather than requiring separate parts for each function.
Solution Approach 2:
The collar combines several elements into one integrated structure: the flange portion for spring member mounting, the cylindrical portion for brake disc engagement, and the hollow cavity for bolt head accommodation. This merging of functions reduces the overall number of parts while achieving the desired layout flexibility.
3Area of stationary object
If the bolt head does not project from the collar, then space on the lateral outer side is ensured, but the bolt fastening mechanism becomes more complex
Solution Approach 1:
The bolt head is nested within the hollow cylindrical portion of the collar, eliminating lateral projection. This nesting arrangement ensures that the entire bolt head is contained within the collar's internal cavity, thereby guaranteeing clear space on the lateral outer side for caliper brackets and other braking components without requiring additional fastening complexity.
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 enhances the flexibility of layout on the lateral outer side of the brake disc by accommodating the bolt head within the collar, preventing interference with other components and maintaining a space-saving structure, while ensuring reliable fastening of the collar both axially and perpendicularly.
Implementation Method 1
a spring member is interposed between the flange portion of the collar and the brake disc
Data Source
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AI summary
A brake disc fastening structure in a saddle seat type vehicle such that a collar (57) is fitted in a mounting hole (70C) of a brake disc (70) mounted to a wheel, the collar (57) having a cylindrical portion (58) inserted in the mounting hole (70C) and a flange portion (59) formed at the laterally outer end of the cylindrical portion (58), that a spring member (65) is interposed between the flange portion (59) and the brake disc (70), and that the brake disc (70) is mounted to the wheel in a floating manner by a bolt (72) extending through the collar (57) and screwed into the wheel from the laterally outer side of the vehicle. The collar (57) further has a bottom portion (60A) formed at the laterally inner end of the cylindrical portion (58) opposed to the wheel. The space defined by the cylindrical portion (58) and the bottom portion (60A) of the collar (57) is formed as a bolt head accommodating recess (60) for accommodating a head portion (72A) of the bolt (72).