Electromechanical Disc Brake Clutch Torque Release
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Solution Overview
Problem
Electromechanical disc brakes face performance deterioration due to slowed operating speed and high load generation from rotational inertia during braking and release, affecting braking performance.
Innovation Solution
An electromechanical disc brake design incorporating a piston, actuator with a planetary gear assembly, a clutch device with a torsion spring for torque release, and an output conversion device using a ball-in ramp mechanism to convert rotational motion into linear motion, allowing for improved braking release speed and reduced motor operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor and speed reduction device are operated with forward and reverse rotation for braking and releasing, then the braking function is achieved, but the operating speed is slowed by rotational inertia and high load is generated
Solution Approach 1:
Instead of using reverse rotation of the motor to release the brake, the invention uses a one-way clutch to allow the planetary gear assembly to rotate in reverse automatically when the motor stops. This inversion of the release mechanism eliminates the need for motor reverse rotation, thereby improving operating speed while maintaining braking reliability
Solution Approach 2:
The invention extracts the reverse rotation function from the motor by introducing a one-way clutch mechanism. The clutch allows the planetary gear assembly to rotate in reverse independently of the motor, separating the braking function from the motor's reverse rotation operation and eliminating the rotational inertia penalty
2Reliability
If the motor and speed reduction device are operated with forward and reverse rotation for braking and releasing, then the braking function is achieved, but high load is generated in the motor and speed reduction device
Solution Approach 1:
The invention inverts the brake release mechanism by using a one-way clutch that allows automatic reverse rotation of the planetary gear assembly when the motor stops. This eliminates the need for motor reverse rotation, thereby reducing the load on the motor and speed reduction device while maintaining the braking function
Solution Approach 2:
The one-way clutch enables the planetary gear assembly to perform the brake release function automatically through its own reverse rotation capability. The system uses the stored kinetic energy and the clutch's inherent one-way rotation property to release the brake without requiring additional motor power, making the release process self-service and reducing motor load
3Duration of action of stationary object
If a one-way rotating motor is used for braking only, then the number of motor operations is reduced, but the brake release mechanism becomes more complex
Solution Approach 1:
The invention introduces a one-way clutch as an intermediary component between the motor and the planetary gear assembly. This clutch mediates the power transmission by allowing forward rotation during braking while automatically permitting reverse rotation during release, thereby extending motor lifetime without significantly increasing overall system complexity
Solution Approach 2:
The one-way clutch provides dynamic power transmission control, automatically changing the power flow direction based on operational requirements. During braking, it transmits power in the forward direction; during release, it allows reverse rotation of the planetary gear assembly. This dynamic behavior simplifies the overall control mechanism while extending motor lifetime
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
Enhances braking release speed and extends motor lifetime by reducing the number of operating rotations through clutch-based torque release, improving braking performance and motor efficiency.
Implementation Method 1
an output conversion device for converting a rotational motion from the speed reduction device into a linear motion and imparting a thrust to move the piston
Implementation Method 2
an elastic member for moving the output conversion device to the original position when releasing braking
Implementation Method 3
The clutch device may include a torsion spring for tightening or loosening an outer circumference of the ring gear
Implementation Method 4
a speed reduction device for reducing a rotation speed of the motor, and the speed reduction device may include a planetary gear assembly having a sun gear, a ring gear, planetary gears, and a carrier
Data Source
AI summary
Disclosed is an electromechanical disc brake. The electromechanical disc brake includes a piston slidably disposed in a cylinder of a caliper housing to press a pad plate, an actuator including a motor and a speed reduction device for reducing a rotation speed of the motor, an output conversion device for converting a rotational motion from the speed reduction device into a linear motion and imparting a thrust to move the piston, an elastic member for moving the output conversion device to the original position when releasing braking, and a clutch device for releasing a torque acting on the speed reduction device such that the output conversion device is moved to the original position by the elastic member when releasing the braking.