Radial Disk Parking Brake for Thermal Expansion Compensation
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Solution Overview
Problem
Conventional PIC-type parking brakes experience a decrease in parking braking performance due to thermal expansion of the disk, leading to a gap between the disk and the friction material, which cannot be effectively compensated for by existing solutions.
Innovation Solution
A parking brake design that includes a disk rotating with a vehicle's wheel, a carrier with a rotational shaft that advances and retracts to press the outer circumferential surface of the disk in a radial direction, and a friction pad made of a strong material to generate braking force, minimizing performance deterioration due to thermal expansion and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a friction material with a relatively high coefficient of friction is used to compensate for the gap between the disk and friction material, then the parking braking performance is improved, but brake noise increases
Solution Approach 1:
The patent changes the physical state of the friction material from solid to liquid (brake fluid), fundamentally altering the friction mechanism. Instead of relying on high-friction solid materials that generate noise, the invention uses hydraulic pressure to transmit force through a fluid medium, eliminating contact friction and its associated noise while maintaining effective braking force transmission to the disk.
2Ease of operation
If the disk is allowed to thermally expand during braking, then the braking operation is smooth, but a gap occurs between the disk and friction material when the disk cools, reducing parking braking performance
Solution Approach 1:
The patent introduces brake fluid as an intermediary medium between the actuator and the disk. The hydraulic fluid transmits force through the braking system without being directly affected by thermal expansion of the disk. When the disk expands during braking, the incompressible brake fluid maintains constant pressure transmission, preventing gap formation and ensuring consistent parking braking performance regardless of thermal conditions.
3Device complexity
If a mechanical structure with cable operation is used for parking brake function, then the device complexity is reduced, but the braking performance deteriorates due to thermal expansion and wear
Solution Approach 1:
The patent replaces the mechanical cable operation system with a hydraulic system. Instead of using cables and mechanical linkages that are susceptible to wear and thermal expansion effects, the invention uses brake fluid under pressure to transmit force. This substitution eliminates the wear issues associated with mechanical components while maintaining relatively simple device structure, and the incompressible nature of the hydraulic fluid ensures consistent force transmission regardless of thermal conditions.
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 proposed parking brake effectively maintains braking performance by using a strong friction pad to press the disk radially, reducing the impact of thermal expansion and wear, thereby enhancing operational reliability compared to conventional PIC-type parking brakes.
Implementation Method 1
an elastic member between the carrier and the friction pad, configured to provide an elastic force to allow the friction pad to be rotated about the rotational shaft
Implementation Method 2
a friction pad coupled to the carrier to be rotatable about the rotational shaft, configured to pressurize or depressurize at least a portion of the outer circumferential surface of the disk in response to reciprocating motion of the carrier
Data Source
AI summary
A parking brake according to an embodiment of the present disclosure includes a disk configured to rotate with a wheel of a vehicle, a carrier having a rotational shaft formed at one side, configured to advance and retract by an actuator toward an outer circumferential surface of the disk, and a friction pad coupled to the carrier to be rotatable about the rotational shaft, configured to pressurize or depressurize at least a portion of the outer circumferential surface of the disk in response to reciprocating motion of the carrier.