Telescopic Ball Screw Brake Assembly for Faster Pad Actuation
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Solution Overview
Problem
Conventional brake systems, such as hydraulic braking, are inefficient in terms of braking time and control, especially when compared to electro-mechanical brake systems, which require improved mechanisms for faster actuation and precise control of brake pads relative to the rotor.
Innovation Solution
A brake assembly utilizing a telescopic multiple ball screw mechanism with extensible and retractable ball nuts and screws, where the rotatable and translatable parts are coupled through rolling bodies to convert rotary motion into linear motion, allowing simultaneous rotation and axial translation to move brake pads effectively, and an actuator system with a multi-stage drive mechanism for efficient braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional hydraulic braking system is used, then the braking system is simple in structure, but the braking time is long and control precision is poor
Solution Approach 1:
The brake assembly is divided into multiple independent ball screw mechanisms, each capable of independent actuation. This segmentation allows for precise control of individual brake pads while maintaining a relatively simple overall structure, resolving the contradiction between fast braking response and structural simplicity
Solution Approach 2:
The patent replaces the conventional hydraulic braking system with an electro-mechanical ball screw mechanism. This substitution eliminates the need for hydraulic fluid and complex valve systems, reducing structural complexity while enabling faster and more precise braking control through direct electrical actuation
2Measurement precision
If an electro-mechanical brake system is used, then the control precision is improved, but the brake assembly structure becomes more complex
Solution Approach 1:
The ball screw mechanism serves multiple functions simultaneously: it converts rotational motion to linear motion, provides mechanical advantage for force multiplication, and enables precise positioning of brake pads. This multi-functionality reduces the need for separate components, thereby improving control precision without proportionally increasing structural complexity
Solution Approach 2:
The brake assembly employs a nested structure where the rotatable and translatable part is positioned within the fixed part, and the brake pad assembly is positioned within the translatable part. This nesting arrangement compactly integrates multiple functional components, improving control precision while minimizing the overall structural footprint
3Productivity
If a telescopic multiple ball screw mechanism is used, then the braking efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent combines the rotatable function and translatable function into a single integrated ball screw mechanism. The rotatable and translatable part simultaneously performs both rotational movement (driven by the actuator) and translational movement (pushing the brake pad), merging multiple functions into one component to improve braking efficiency while limiting complexity increase
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 solution reduces brake apply and release time, increases efficiency, and provides uniform brake pressure distribution, enabling faster and more controlled braking operations compared to conventional systems.
Implementation Method 1
a rotatable and translatable part comprising an outer ball screw and an inner ball nut, wherein the outer ball screw is operably coupled with the outer ball nut of the fixed part through first rolling bodies
Implementation Method 2
the outer ball screw is operably coupled with the outer ball nut of the fixed part through first rolling bodies
Implementation Method 3
the brake pads are moved into frictional engagement with the opposed braking surfaces of the rotor
Data Source
AI summary
A brake assembly with multiple telescoping structures comprises: a rotatable part configured to be rotated by an actuator; a fixed part comprising an outer ball nut fixed to a housing; a rotatable and translatable part comprising an outer ball screw and an inner ball nut, wherein the outer ball screw is operably coupled with the outer ball nut through first rolling bodies, and the rotatable and translatable part is operably coupled with the rotatable part and is rotatable relative to the outer ball nut and axially translatable relative to the rotatable part and the outer ball nut simultaneously by rotation of the rotatable part; a translatable part comprising an inner ball screw operably coupled with the inner ball nut through second rolling bodies and configured to be axially translated relative to the inner ball nut by rotation of the inner ball nut to move a brake pad assembly.