Internally Ventilated Brake Disc Mounting for Uniform Cooling
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Solution Overview
Problem
Existing brake disc designs for motor vehicles suffer from uneven cooling and relative movement between the friction ring and brake disc hub due to clamping sleeves with transverse pins, leading to inadequate ventilation and potential abrasive wear.
Innovation Solution
An internally ventilated brake disc design featuring a single friction ring half with material bulges and radially directed connecting means like clamping sleeves or blind rivets, allowing for even cooling and reduced stress buildup, with the connecting means placed laterally to maintain an open cooling channel cross-section and using lightweight materials for the brake disc hub to compensate for thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If clamping sleeves with transverse pins are used to connect the friction ring and brake disc hub, then the connection strength is improved, but the cooling channel ventilation is blocked and uneven cooling occurs
Solution Approach 1:
The harmful transverse pins that block cooling channels are removed from the design. The connection is achieved using only clamping sleeves that wrap around the friction ring, eliminating the need for pins that would obstruct the cooling channels and cause uneven temperature distribution.
Solution Approach 2:
The clamping sleeve is divided into multiple segments or sections that can be positioned to avoid blocking the cooling channels. This segmentation allows the connection elements to be distributed in a way that maintains open cooling pathways while still providing sufficient clamping force.
2Stability of the object's composition
If clamping sleeves with transverse pins are used to secure the friction ring, then the friction ring is firmly fixed, but radial expansion during heating causes relative movement and abrasive wear
Solution Approach 1:
The transverse pins that create stress concentration points and potential wear surfaces are completely removed. The connection relies solely on the clamping sleeve's friction grip and radial clamping force, which accommodates thermal expansion more uniformly without creating relative movement and abrasive wear.
3Reliability
If the brake disc hub and friction ring are connected with multiple connecting elements, then the connection reliability is improved, but the installation complexity and cost increase
Solution Approach 1:
Multiple separate connecting elements (clamping sleeves with pins) are merged into a single simplified clamping sleeve design. This integration reduces the number of parts to be installed while maintaining or improving connection reliability through the sleeve's continuous radial clamping action around the friction ring.
Solution Approach 2:
The clamping sleeve is designed to perform multiple functions simultaneously: providing radial clamping force, accommodating thermal expansion, and securing the friction ring to the hub. This multi-functionality eliminates the need for separate pins and other fastening elements, simplifying installation while maintaining reliability.
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 design ensures even cooling, minimizes relative movement and abrasive wear, and facilitates easy installation while maintaining a secure fit between the brake disc hub and friction ring, even under thermal expansion, thus enhancing the brake disc's performance and durability.
Implementation Method 1
these friction rings are often designed as internally ventilated rings, meaning they are provided with channels or bores through which air flows to improve heat dissipation
Implementation Method 2
This dissipates the kinetic energy of the motor vehicle in the form of frictional heat, thus decelerating the vehicle
Implementation Method 3
radial expansion of the hub and friction ring due to heating during braking occurs precisely in the area of the clamping sleeve
Data Source
Figure 1~2
AI summary
The invention relates to a disc brake for a motor vehicle, said disc brake comprising an internally ventilated brake disc (1) at least consisting of: a friction ring (2) having an outer friction surface (4', 4'') on each of two friction ring halves (2', 2'') which are connected by ribs (5) located therebetween, said ribs forming cooling channels (6) between the friction ring halves; and a brake disc chamber (3) which is connected to the friction ring via radially oriented connecting means, in particular clamping sleeves or blind rivets, and which has a collar (9) on its casing (10), said collar extending in the radial direction, forming a fit with an outer peripheral surface at an outer diameter of the friction ring and with an inner peripheral surface at an inner diameter of the friction ring, and having radially oriented first bores (16) into which the connecting means are inserted such that said means extend further into second bores (17) in the friction ring, which are also radially oriented, and the brake disc chamber forms the fit with a single friction ring half and said friction ring half has material protrusions directed inwardly toward the cooling channels or toward the ribs at the positions at which the second bores (17) are inserted for accommodating part of the connecting means.