Vehicle Parking Brake Load Transmission Unit
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Solution Overview
Problem
Existing parking brake systems for vehicles often experience uneven load transmission to brake pads, leading to friction pad wear and degraded braking performance when multiple pistons are driven by a single actuator.
Innovation Solution
A parking brake apparatus featuring a load transmission unit with a pair of ring gear sections that allows for uniform load distribution between pressing units, ensuring each brake pad receives consistent pressure through a network of sun gear, planetary gear, and carrier sections connected to motor sections, thereby balancing the load across multiple pistons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single actuator drives multiple pistons, then the device complexity is reduced, but the load transmission uniformity deteriorates causing uneven wear
Solution Approach 1:
A load transmission unit is introduced as an intermediary component between the actuator and multiple pistons. This unit includes load transmission members that mechanically couple the actuator's output to multiple pistons, ensuring that the pressing load is uniformly distributed to each piston regardless of the actuator's single-point actuation, thereby resolving the contradiction between simplified actuator configuration and uniform load transmission
Solution Approach 2:
The load transmission function is extracted from the actuator itself and separated into a dedicated load transmission unit. This separation allows the actuator to remain simple while the load transmission unit specifically handles the uniform distribution of pressing loads to multiple pistons, addressing the contradiction by assigning distinct functions to different components
2Ease of operation
If pressing load is concentrated on one piston, then the device operation is simpler, but the friction pad wear increases unevenly
Solution Approach 1:
The load transmission unit acts as a mediator that receives the pressing load from a single actuator and redistributes it uniformly to multiple pistons. The load transmission members within this unit ensure that even when power is applied at one location, the resulting pressing force is evenly distributed across all friction pads, preventing uneven wear while maintaining simple operation
Solution Approach 2:
Multiple pistons are merged into a unified pressing system through the load transmission unit. Although each piston is actuated separately, the load transmission members connect them in such a way that they work together as an integrated system, ensuring uniform load distribution and preventing uneven wear while allowing simple single-point actuation
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 solution ensures uniform load transmission to brake pads, preventing uneven wear and enhancing braking performance by dynamically connecting and balancing the power transmission between multiple pressing units, even when power is applied unevenly.
Implementation Method 1
a planetary gear section rotated by being meshed with the sun gear section
Implementation Method 2
two friction pads mounted to the piston and the caliper housing are pressed against both surfaces of a disc to restrain the rotation of the disc
Data Source
AI summary
A parking brake apparatus for a vehicle includes a driving unit including a plurality of motor sections; a pair of pressing units receiving power from the driving unit and pressing a brake pad; and a load transmission unit installed between the pair of pressing units, connected to each of the pair of pressing units, and transmitting a pressing load of any one of the pair of pressing units to the other pressing unit.