Coaxial Ring Vibration Damper for Disc Brake Actuator Motors
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Solution Overview
Problem
Electric motor gear units in disc brake actuators often generate vibrations and noise, causing discomfort and potential damage due to their inability to effectively dampen these movements.
Innovation Solution
A motor gear unit with a damping device comprising two coaxial rings and a connecting ring, produced from ethylene-propylene-diene monomer, that restricts both axial and radial movements of the electric motor, reducing vibrations and noise by acting as a single-piece assembly within the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the electric motor is mounted in the housing without additional damping elements, then the structure is simple and compact, but vibrations and noise are generated causing discomfort and potential damage
Solution Approach 1:
The damping device merges multiple damping functions (axial damping and radial damping) into a single integrated component that is mounted on the motor housing. This single piece combines the functionality of what would otherwise require separate damping elements, reducing overall structural complexity while effectively addressing vibrations and noise in multiple directions simultaneously.
Solution Approach 2:
The damping device acts as an intermediary element between the electric motor and the housing. It mediates the transmission of vibrations by providing controlled damping in both axial and radial directions, reducing the harmful transmission of motor vibrations to the housing and surrounding structures without requiring fundamental changes to the motor or housing design.
2Object-generated harmful factors
If damping elements are added to reduce motor vibrations, then noise and vibrations are reduced, but the device complexity and number of components increase
Solution Approach 1:
The damping device combines axial damping capability and radial damping capability into a single integrated component. Instead of requiring separate axial dampers and radial dampers, this merged design achieves both damping functions simultaneously, reducing the number of components while effectively reducing noise production from multiple vibration directions.
3Reliability
If the motor is allowed to move freely in the housing, then assembly is simple, but vibrations cause discomfort and potential damage to the motor gear
Solution Approach 1:
The damping device is pre-mounted on the motor housing during assembly, establishing the damping function before the motor is installed. This preliminary action ensures that when the motor is assembled into the housing, the damping protection is already in place, maintaining assembly simplicity while ensuring motor stability and reliability from the start.
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 device effectively limits motor vibrations and noise production by up to 2 dB, enhancing the operational stability and reducing noise levels in the motor gear unit.
Implementation Method 1
a damping device (1) capable of being positioned on an end part of the electric motor (4), said damping device comprising an element for axial damping of movements of the motor (4) in said axial direction and a radial damping element of the movements of the motor (4) in a radial direction of the electric motor (4)
Data Source
AI summary
A noise-damping device for a geared motor unit including a housing containing an electric motor having an axis, and a reduction mechanism is disclosed. The device includes two coaxial rings, connected radially to one another by a connection ring, including a first ring positioned inside a second ring, the damping device being able to be positioned at an end part of the electric motor, the first and second rings being arranged against the end part of the electric motor so as to damp the movements of the electric motor in the housing in radial and axial directions.