Electronic Parking Brake Elastic Force Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic parking brake systems experience a decrease in braking force due to temperature changes and frictional contraction, leading to unstable parked vehicle states and potential safety accidents.
Innovation Solution
An electronic parking brake apparatus featuring a power generating unit, a braking force transmission unit, and a braking force supplementing unit with an elastic member that uses elastic restoring force to maintain contact between the brake friction member and drum, ensuring consistent braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the main brake is released after manipulating the parking brake apparatus, then the vehicle can be moved, but parking braking force is partially lost causing unstable parked state
Solution Approach 1:
The elastic member is pre-compressed by the nut screw to store elastic energy before braking is needed. This preliminary action ensures that when the brake friction member experiences frictional contraction or temperature changes, the elastic member can immediately exert restoring force to maintain contact pressure, preventing loss of parking braking force and ensuring stable parked state.
Solution Approach 2:
The elastic member acts as a cushioning element that compensates for potential losses in braking force due to frictional contraction or temperature variations. By being pre-positioned and pre-compressed, it provides a safety margin that maintains reliable contact between the brake friction member and drum, preventing unstable parked states.
2Temperature
If the brake friction member contracts due to temperature change, then thermal expansion/contraction occurs, but frictional force between brake friction member and drum decreases
Solution Approach 1:
The elastic member dynamically adjusts the contact pressure parameter between the brake friction member and drum. When temperature changes cause the brake friction member to contract, the elastic member's restoring force compensates for the reduced frictional force by maintaining adequate contact pressure, ensuring that the frictional force remains sufficient for reliable braking.
3Productivity
If parking braking force decreases, then braking performance is reduced, but vehicle safety is compromised
Solution Approach 1:
The elastic member provides a mechanical feedback mechanism that automatically responds to changes in braking force. When parking braking force decreases due to frictional contraction or other factors, the pre-compressed elastic member exerts restoring force to increase contact pressure, thereby restoring the braking force to the required level and maintaining vehicle safety.
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 apparatus effectively maintains stable parking braking force, preventing unwanted vehicle movement and reducing the risk of safety accidents by supplementing braking force through elastic restoration.
Implementation Method 1
a braking force supplementing unit with an elastic member that uses elastic restoring force to maintain contact between the brake friction member and drum
Implementation Method 2
a gear unit and a nut screw are rotated as the motor is rotated, a bolt screw, which penetrates the nut screw, is moved in a longitudinal direction thereof
Implementation Method 3
a motor which generates power based on the external signal
Implementation Method 4
a brake friction member and a brake drum come into close contact with each other, thereby braking a vehicle by using parking braking force that is generated when the brake friction member and the brake drum come into close contact with each other
Data Source
AI summary
Disclosed is an electronic parking brake apparatus. The electronic parking brake apparatus includes: a power generating unit which generates power based on an external signal; a braking force transmission unit which is coupled to the power generating unit in a threaded connection manner, rectilinearly moves by the power, and transmits braking force generated by the rectilinear movement; a braking force supplementing unit which is disposed to be adjacent to the power generating unit while surrounding the braking force transmission unit in order to prevent the braking force from being decreased; and a brake body part which is connected with the braking force transmission unit and parks a vehicle by using the braking force.