Disc Brake Boot Structure for Lower Guide Rod Clamping
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Solution Overview
Problem
Conventional disc brake boots exert excessive clamping force on guide rods due to their large contact area, leading to brake drag and safety issues, as they lack flexibility and fail to completely release braking force when not in use.
Innovation Solution
A disc brake boot design featuring a main body with protrusions and grooves that reduce contact area with the carrier, incorporating a hollow for the guide rod, and strategically positioned projections and ribs to distribute pressure and prevent foreign material entry, while maintaining sealing functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the boot has a large contact area with the carrier, then the boot provides good protection and sealing, but the clamping force on the guide rod increases causing brake drag
Solution Approach 1:
The boot is divided into multiple functional zones with different contact characteristics. The first outer projection provides sealing contact with the carrier, while the second outer projection provides localized clamping. This segmentation allows the boot to simultaneously achieve good sealing and controlled clamping force distribution.
Solution Approach 2:
Different regions of the boot have different contact properties: the first outer projection makes surface contact for sealing, while the second outer projection is pressed against for localized clamping. The inner projection contacts the guide rod only where necessary. This local differentiation resolves the contradiction between overall protection and localized force application.
2Object-affected harmful factors
If the boot exerts more clamping force on the guide rod, then the boot provides better protection against foreign materials, but brake drag increases and safety is compromised
Solution Approach 1:
The sealing function is segmented from the clamping function. The first outer projection handles sealing against foreign materials through surface contact, while the second outer projection handles clamping. This separation ensures that foreign material protection does not require excessive overall clamping force, thereby maintaining brake safety.
Solution Approach 2:
The boot acts as an intermediary element that provides both sealing and clamping functions through its structured design. The multiple projections and grooves create intermediate contact zones that achieve protection without excessive force transmission to the guide rod, preventing brake drag while maintaining safety.
3Force
If the boot is made more flexible, then brake drag is reduced, but the sealing and protection capability may be compromised
Solution Approach 1:
The boot incorporates dynamic contact characteristics through its projection-groove structure. The first and second outer projections can adapt their contact pressure based on operational conditions, providing flexible sealing and clamping that responds to movement while maintaining protection capability.
Solution Approach 2:
The boot functions as a flexible protective shell with integrated structural features. The thin-walled structure with projections and grooves provides both flexibility for reduced clamping force and sufficient sealing capability through the geometric features that maintain contact with the carrier and guide rod.
Data Source
AI summary
A disc brake boot and a disc brake including the same are provided. The disc brake boot includes: a main body formed with a hollow that runs lengthwise through which a guide rod passes and is coupled; a first outer projection that is formed on an outer side of the main body in such a way as to protrude a set distance from one edge of the main body, along the perimeter of the main body; and a second outer projection that is formed on the outer side of the main body in such a way as to protrude a set distance along the perimeter of the main body, spaced apart from the first outer projection.