Ball Screw Drive Damping Ring for Brake Actuator Vibration
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Solution Overview
Problem
Existing ball screw drives in brake systems of motor vehicles lack effective damping mechanisms to manage bending vibrations and acoustic behavior.
Innovation Solution
Incorporation of a concentric damping element, such as a damping ring, within the ball screw drive to absorb relative movements and reduce bending vibrations, with adjustable materials and preloads for optimized damping properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional damping mechanism is arranged between the driven push rod and housing, then the damping element is positioned away from the ball screw drive components, but the damping effectiveness is reduced due to greater distance from the vibration source
Solution Approach 1:
The damping element is nested within the ball screw drive structure, specifically positioned between the threaded spindle and the housing bore. This nested arrangement allows the damping element to be integrated into the existing structural space without adding external components, thereby achieving effective damping while maintaining structural simplicity.
Solution Approach 2:
The damping element is arranged in the radial direction between the threaded spindle outer circumference and the housing bore inner circumference, rather than in the axial direction between push rod and housing. This dimensional change places the damping element closer to the vibration source components while utilizing available radial space.
2Reliability
If the damping element is placed close to the ball screw drive components, then damping effectiveness is improved, but the structural space requirements increase
Solution Approach 1:
The damping element is nested within the existing structural space between the threaded spindle outer circumference and the housing bore inner circumference. This utilizes otherwise unused radial space within the ball screw drive assembly, achieving effective damping without increasing the overall external dimensions or requiring additional structural volume.
3Reliability
If a damping element is added to the ball screw drive, then bending vibrations are reduced, but the device complexity increases
Solution Approach 1:
The damping element serves multiple functions: it provides damping to reduce bending vibrations, acts as a structural filler between the threaded spindle and housing bore, and can be designed to work with the existing anti-rotation element. This multi-functionality achieves vibration control without significantly increasing device complexity.
Solution Approach 2:
The damping element's properties (material composition, hardness, preloading force) can be adjusted to achieve the desired damping effect. By optimizing these parameters, effective vibration control is achieved with a single component rather than requiring multiple specialized parts.
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 damping ring significantly reduces bending vibrations, improving the acoustic performance and operational stability of the ball screw drive.
Implementation Method 1
a damping element (24) of the ball screw drive (1), which is rigidly connected to one of the two spindle drive elements (2, 3) and can be rotated and moved relative to the other spindle drive element such that the damping element is free of play
Implementation Method 2
the damping element absorbs relative movements to a greater extent than in the case of conventional damping components
Data Source
AI summary
A ball screw drive, in particular for an actuator of a hydraulic brake system, includes two spindle drive elements, namely a threaded spindle and a spindle nut which can be rotated relative to the threaded spindle. One of the spindle drive elements is provided as a rotatable drive element, and the second spindle drive element is provided as an output element which can be moved in a secured manner against rotation. The ball screw drive additionally includes a damping element that is configured as an annular element concentric relative to a central axis of the threaded spindle. The annular element is rigidly connected to one of the two spindle drive elements, and can be simultaneously rotated and moved relative to the other spindle drive element in a play-free manner.