Friction Ring Protuberances for Composite Brake Drum Heat Dissipation
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Solution Overview
Problem
Current composite brake drum manufacturing processes are costly and inefficient, with existing methods failing to effectively reduce the weight and enhance the heat dissipation capabilities of brake drums while maintaining mechanical strength, leading to overheating and reduced braking performance.
Innovation Solution
A friction ring made from a steel sheet with annular shape and protrusions formed by punching, overmolded with an aluminum alloy to create a composite brake drum that enhances heat dissipation and mechanical strength, reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a friction ring with protuberances formed by punching a steel strip is used, then manufacturing cost is reduced and heat dissipation is improved, but the mechanical strength and structural integrity may be compromised
Solution Approach 1:
The friction ring incorporates protuberances at specific locations on its outer peripheral surface through punching the steel strip. These localized structural features provide anchoring points for the overmolded aluminum alloy while maintaining the overall simplicity and low cost of the friction ring manufacturing process. The local modification of the strip structure resolves the contradiction between ease of manufacture and mechanical strength.
Solution Approach 2:
The friction ring combines a steel strip base material with an overmolded aluminum alloy to create a composite structure. The steel strip provides the friction surface and structural framework, while the aluminum alloy overmolding enhances heat dissipation and mechanical strength. This composite approach allows the friction ring to achieve improved thermal management and structural integrity without significantly increasing manufacturing complexity.
2Temperature
If the friction ring is made from a steel strip with protuberances, then the heat dissipation capability is enhanced, but the manufacturing process complexity increases
Solution Approach 1:
The manufacturing process utilizes punching operations to create protuberances on the steel strip, which is a standard metal forming process. This method changes the physical parameters of the strip (creating localized protrusions) through a well-established manufacturing technique, thereby enhancing heat dissipation capability through increased surface area and improved thermal contact with the overmolded aluminum alloy without introducing complex manufacturing steps.
3Strength
If an aluminum alloy is overmolded around the friction ring, then heat dissipation and mechanical strength are improved, but manufacturing cost increases
Solution Approach 1:
The aluminum alloy is overmolded around the friction ring in a nested configuration, where the friction ring (steel strip with protuberances) is inserted into the aluminum alloy matrix. The protuberances protrude into the aluminum alloy, creating mechanical interlocking. This nesting approach allows the aluminum alloy to enhance heat dissipation and structural strength while the friction ring maintains its low-cost steel strip construction, thereby balancing performance improvement with manufacturing cost considerations.
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
The solution significantly reduces the manufacturing cost of composite brake drums, improves heat dissipation, and maintains mechanical strength, effectively addressing overheating issues and enhancing braking performance.
Implementation Method 1
The main body is overmolded around the friction ring in such a way as to embed the protuberance of the strip in order to prevent relative movement of the friction ring with respect to the main body... the main body further having: an internal surface in contact with the friction ring... improves heat dissipation
Data Source
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AI summary
The present invention relates to a friction ring (1) for a brake drum (1), preferably for a composite brake drum in which the friction ring (1) forms an overmoulding insert by means of a method for casting a metal, for example an aluminium alloy, the friction ring (1) having an axis of symmetry (X-X) and comprising a sheet metal strip (10), preferably a sheet steel strip, the strip (10) having an annular shape about the axis of symmetry (X-X), the annular shape having been formed by rolling the strip (10), and the friction ring comprising at least one projection (12) that has been formed by stamping the strip (10).