Belt Planetary Gear Decelerator for Compact Parking Brake
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Solution Overview
Problem
Existing electronic parking brake systems face challenges with increased size and noise due to multi-stage gear configurations, which limit their installation to midsize or larger vehicles and reduce the lifespan of components.
Innovation Solution
The introduction of a belt planetary gear part with a solar gear, belt gear, transmission plate, and ring gear, which reduces noise and vibration by decelerating rotational force through a belt mechanism, allowing for a more compact design and improved power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multi-stage gear configurations are used to amplify motor driving force, then the braking performance is improved, but the overall volume of the electronic parking brake increases and it is limited to midsize or larger vehicles
Solution Approach 1:
The patent replaces the traditional multi-stage mechanical gear system with a belt-driven planetary gear mechanism. This substitution maintains the force amplification function while significantly reducing the overall volume. The belt drive system eliminates the need for complex multi-stage gear arrangements, achieving the same braking performance in a more compact configuration that can be installed in smaller vehicles.
Solution Approach 2:
The patent employs a planetary gear mechanism where gears are nested within each other in a compact arrangement. The sun gear, planet gears, and ring gear are positioned concentrically, allowing the decelerator to achieve high force multiplication in a minimal space. This nested configuration dramatically reduces the volume compared to linear multi-stage gear trains.
2Power
If multi-stage gear configurations are used to amplify motor driving force, then the braking performance is improved, but the operating noise increases
Solution Approach 1:
The patent replaces direct metal-to-metal gear meshing with a belt-driven system. The belt acts as a flexible intermediary that transmits power while absorbing vibrations and reducing noise. This substitution eliminates the harsh noise generated by multi-stage gear engagements while maintaining the force amplification necessary for effective braking performance.
3Power
If multi-stage gear configurations are used to amplify motor driving force, then the braking performance is improved, but the lifespan of components is reduced
Solution Approach 1:
The patent replaces the complex multi-stage gear system with a simplified belt-driven planetary gear mechanism. This reduction in mechanical complexity eliminates multiple stages of gear engagement and disengagement, thereby reducing wear on components. The belt-driven system provides smoother power transmission with fewer contact points, extending the operational lifespan of the electronic parking brake components.
4Volume of moving object
If belt planetary gear part is introduced to reduce noise and volume, then the overall volume is reduced and noise is minimized, but the device complexity changes
Solution Approach 1:
The patent merges the functions of multiple separate components into a single integrated belt planetary gear assembly. The sun gear, planet gears, ring gear, and belt drive mechanism are combined into one compact unit that performs both deceleration and force amplification. This consolidation reduces the overall volume and simplifies the device architecture compared to multi-stage gear systems, while maintaining necessary functionality.
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
This configuration reduces the overall volume of the electronic parking brake, minimizes operating noise, and enhances braking performance by decoupling the power transmission from metal meshing, thereby improving the braking experience and extending component lifespan.
Implementation Method 1
a belt gear (33) connected to the solar gear (31) and engaged with the ring gear (32)
Implementation Method 2
decelerate the rotation and amplify the torque
Data Source
AI summary
Disclosed herein is an electronic parking brake including: a carrier fixed to a body of a vehicle; a caliper housing that is slidably installed in the carrier; a motor that is disposed at an outside of the caliper housing and generates a rotational force; a decelerator that amplifies the rotational force of the motor; and a conversion unit that converts a rotational force transmitted from the decelerator into a rectilinear motion, wherein the decelerator includes a belt planetary gear part, and the belt planetary gear part includes: a solar gear rotated by receiving the rotational force of the motor; a belt gear engaged with the solar gear; a transmission plate that is connected to the belt gear and has belt support parts for supporting the belt gear so that the belt gear is rotatable; and a ring gear that is engaged with an outer surface of the belt gear and fixed to the belt gear so as to rotate the transmission plate.