Metal Sleeve for Ceramic Brake Disk Stud Attachment
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Solution Overview
Problem
Conventional carbon-ceramic brake disks face damage risks due to direct contact between ceramic materials and threaded mounting studs, necessitating careful pressure management during attachment and operation to prevent ceramic material damage.
Innovation Solution
A metal sleeve with a collar and flanging is inserted into the ceramic brake disk's hole, providing a slip-proof, captive attachment that distributes pressure uniformly and prevents direct contact between the ceramic material and the stud, thereby reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct attachment of ceramic brake disk to wheel hub using threaded studs is used, then structural simplicity is improved, but ceramic material damage occurs due to concentrated pressure from threaded studs
Solution Approach 1:
A sleeve made of metal or metal-like material is inserted into the receiving hole of the ceramic brake disk, serving as an intermediary between the threaded mounting stud and the ceramic material. This sleeve distributes the pressure from the stud over a larger area of the ceramic material, preventing concentrated loads that would cause damage while maintaining the threaded attachment functionality.
Solution Approach 2:
The pressure distribution parameter is changed by introducing the sleeve, which transforms the concentrated pressure from the threaded stud into a distributed pressure across the sleeve's contact surface with the ceramic material. This parameter change ensures the pressure remains below the damage threshold of the ceramic material.
2Ease of operation
If receiving holes for mounting studs are made in ceramic material to enable direct attachment, then ease of installation is improved, but pressure concentration causes ceramic material damage
Solution Approach 1:
The sleeve acts as a protective intermediary within the receiving hole, allowing the mounting stud to be installed while preventing direct contact between the threaded stud and the ceramic material. This maintains installation ease while protecting the ceramic material from pressure-induced damage.
3Strength
If pressure from mounting studs is concentrated on small area of ceramic material, then attachment strength is improved, but ceramic material damage occurs
Solution Approach 1:
The pressure distribution parameter is modified by the sleeve, which increases the contact area between the mounting stud and the ceramic material. This transforms concentrated high pressure into distributed lower pressure, maintaining sufficient attachment strength while preventing ceramic material damage.
Data Source
AI summary
A sleeve for holding a mounting stud in the bore of a ceramic brake disk wherein the sleeve is made of metal and is equipped on one side with a collar, that slip-proof and captive attachment is effected by a flange on the opposite sleeve end, and that neither the collar nor the flange projects over the boundary planes which form the surface of the ceramic brake disk perpendicular to the axis of the bore.