Electromechanical Brake Load Control Unit for Overload Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electromechanical brake devices face structural issues when the motor malfunctions, leading to overloading of the piston unit and linear motion converting mechanism due to misalignment of rotational directions.
Innovation Solution
Incorporation of a load control unit with a pair of friction members and an elastic member between internal and external shafts, allowing differential rotation speeds to manage loads and prevent excessive stress on the piston unit, ensuring stable operation even under overload conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor is directly connected to the piston unit without a load control unit, then the structure is simpler, but the piston unit and linear motion converting mechanism are overloaded when the motor malfunctions or rotates in the wrong direction
Solution Approach 1:
A load control unit is introduced as an intermediary component between the motor and the piston unit. This unit includes friction members that can selectively engage or disengage the connection between the internal shaft (connected to motor) and external shaft (connected to piston unit), preventing overload damage when motor malfunction occurs while maintaining structural simplicity during normal operation
2Productivity
If the internal shaft and external shaft are always rotated together at the same speed, then the power transmission is more efficient, but the piston unit cannot be protected from excessive load when motor malfunction occurs
Solution Approach 1:
The connection between internal shaft and external shaft is made dynamic rather than fixed. The friction members can adjust their engagement state based on load conditions - maintaining synchronized rotation for efficient power transmission during normal operation, and allowing differential rotation speeds to protect against excessive stress when motor malfunction occurs
3Reliability
If friction members are designed to always engage both shafts, then the brake device operates reliably, but the piston unit is damaged when motor rotates in wrong direction or under excessive load
Solution Approach 1:
The friction members are designed with preliminary anti-action capability - they can preemptively disengage the connection between internal and external shafts when detecting abnormal load conditions or reverse rotation, preventing damage before it occurs. The elastic member provides preliminary cushioning to detect load anomalies before they cause damage
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 solution effectively prevents mechanical damage by controlling load distribution and ensuring stable operation of the electromechanical brake device, enhancing its durability and reliability during motor malfunction or reverse rotation errors.
Implementation Method 1
an elastic member provided in the external shaft, so that the first friction member contacts the outer circumferential surface of the internal shaft in a pressurized state
Implementation Method 2
an elastic member provided in the external shaft, so that the first friction member contacts the outer circumferential surface of the internal shaft in a pressurized state
Data Source
AI summary
The present invention is directed to an electromechanical brake device for securing the structural reliability and improving the stability even when overloading. The electromechanical brake device configured to brake by pressing a disk-shaped disc, which is rotated with motor vehicle wheels, with a pair of friction pads, and including a piston unit configured to move the friction pads in a direction of the disc, including: an internal shaft connected to an external motor so as to rotate when the motor is driven; an external shaft, in which an end of the internal shaft is inserted, configured to rotate together when the internal shaft is rotated, and to which the piston unit is connected so as to move in the disc direction; and a load control unit provided between the internal shaft and the external shaft, so that the external shaft is rotated together when the internal shaft is rotated, and the internal shaft and the external shaft are rotated at different speeds when a load of a predetermined value or more is applied between the internal shaft and the external shaft.