Brake Piston Nut Venting Layout for Tolerant Air Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The machining process for air discharge grooves in electronic parking brake systems is challenging, leading to high defective rates and appearance defects due to the difficulty in precisely aligning first and second air discharge grooves.
Innovation Solution
The brake apparatus features a nut with multiple air discharge grooves spaced apart and connected by an air passage groove, allowing for effective air discharge even when grooves are offset, reducing the risk of defects during machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first air discharge groove and the second air discharge groove are machined to be positioned exactly on the same line, then air discharge function is improved, but machining difficulty increases and defective rate increases
Solution Approach 1:
The air discharge grooves are segmented into multiple independent grooves (first air discharge groove and second air discharge groove) positioned at different locations on the nut. This segmentation allows air to be discharged through multiple paths, ensuring reliable air discharge function while reducing the requirement for precise alignment of a single groove.
Solution Approach 2:
The piston cavity acts as an intermediary space that connects the first and second air discharge grooves. Air trapped in the piston cavity can flow through this intermediary space to reach either groove, ensuring effective air discharge even when the grooves are not perfectly aligned, thereby reducing machining precision requirements.
2Reliability
If the first air discharge groove and the second air discharge groove are machined to be positioned exactly on the same line, then air discharge function is improved, but machining process complexity increases
Solution Approach 1:
The air discharge system is segmented into multiple independent grooves located at different positions on the nut. This segmentation simplifies the machining process by allowing each groove to be machined independently without requiring complex coordinated positioning, while still achieving reliable air discharge through multiple paths.
Solution Approach 2:
Instead of requiring a single perfectly positioned groove, the design uses multiple grooves with partial positioning requirements. This excessive action (using more grooves than minimally necessary) compensates for potential machining variations and simplifies the overall machining process by reducing precision requirements for each individual groove.
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 design significantly reduces the defective rate by ensuring efficient air discharge within the piston, minimizing machining errors and appearance defects.
Implementation Method 1
an air passage groove which connects the plurality of air discharge grooves to each other
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A brake apparatus (1) for a vehicle, the brake apparatus (1) including a brake pad (100) configured to pressurize a brake disc (10), a screw bar (200) positioned inside a caliper body (20) and rotated by receiving power from a motor part (30), a piston (300) configured to pressurize the brake pad (100), and a nut (400) rectilinearly moved due to a rotation of the screw bar (200), positioned inside the piston (300), and provided with a plurality of air discharge grooves(423), which are disposed to be spaced apart from each other to discharge air present inside the piston (300), and an air passage groove (424) which connects the plurality of air discharge grooves (423).