Externally Oiled Wet Disk Brake Grooves for Cooling and Low Drag
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Solution Overview
Problem
Existing groove patterns for internal oiling in wet disk brakes are not suitable for external oiling, leading to inadequate convective cooling and increased drag losses in disk brakes.
Innovation Solution
A zigzag-shaped or undulating groove pattern around the circumference of the friction surface, with radially widening inlet grooves and trapezoidal or beveled friction lining pieces to enhance oil supply and distribution, along with blind grooves for improved cooling and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional groove patterns are used for internal oiling, then lubrication is effective, but cooling efficiency is insufficient for external oiling applications
Solution Approach 1:
The friction surface is segmented into multiple functional zones through the groove pattern: a circumferential groove for oil distribution, zigzag/undulating grooves for enhanced cooling and drag reduction, and inlet grooves for oil supply. This segmentation allows each zone to perform its specific function optimally, resolving the contradiction between cooling efficiency and drag losses.
Solution Approach 2:
Different groove patterns are applied to different local areas of the friction surface: inlet grooves with widening sections at the outer radius for oil supply, circumferential grooves for distribution, and zigzag/undulating grooves in specific zones for cooling and drag reduction. This local differentiation optimizes performance for each functional requirement.
2Quantity of substance
If inlet grooves have uniform width, then manufacturing is simple, but oil supply from outside is insufficient when brake is closed
Solution Approach 1:
The inlet grooves feature asymmetric geometry with widening sections at the outer radius and narrower sections toward the center. This asymmetric design maximizes oil supply capacity from the external oiling system while maintaining a manageable manufacturing complexity.
Solution Approach 2:
The inlet groove geometry transitions from a simple linear feature to a three-dimensional form with radial widening, creating a funnel-like or diffuser-like structure. This dimensional change enhances oil supply capacity without proportionally increasing manufacturing 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
The proposed groove pattern enhances cooling efficiency, reduces drag losses, and prolongs the service life of friction lining pieces by optimizing oil supply and convective heat transfer in externally oiled wet disk brakes.
Implementation Method 1
The groove pattern improves the cooling effect... improves the convective cooling/cooling effect
Implementation Method 2
enhances cooling efficiency... optimizing oil supply and convective heat transfer
Implementation Method 3
friction lining pieces which delimit the circumferential groove radially on the outside and the inlet grooves in the circumferential direction are trapezoidal in shape in order to constitute a diffuser-like widening of the inlet groove
Implementation Method 4
friction lining pieces which delimit the circumferential groove radially on the outside and the inlet grooves in the circumferential direction have bevels or chamfers facing one another in the circumferential direction in order to create a funnel-like widening of the inlet groove
Implementation Method 5
reduces drag losses... minimizing drag losses in disk brakes with external oiling
Data Source
AI summary
The invention relates to a wet disk brake with external oiling of a friction surface (34), having a circumference.To improve the cooling of the disk brake with external oiling and to minimize drag losses, the friction surface (34) has a zigzag-shaped or undulating groove running around the circumference or a groove (2) running tangentially around the circumference.