Brake Nut Air-Discharge Groove Layout for Easier Machining
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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 positioning the first and second air discharge grooves on the same line, resulting in burrs and machining errors.
Innovation Solution
The brake apparatus features a nut with multiple air discharge grooves spaced apart and connected by an air passage groove, allowing for offset machining while maintaining effective air discharge functionality, reducing the occurrence of defects.
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 the air discharge function is optimized, but the machining process becomes difficult and the defective rate increases
Solution Approach 1:
The air discharge groove is divided into a first air discharge groove and a second air discharge groove that are spatially separated and connected via an air passage groove. This segmentation allows each groove to be machined independently at different positions on the nut, eliminating the need for precise alignment on the same line while maintaining effective air discharge functionality.
Solution Approach 2:
An air passage groove is introduced as an intermediary element to connect the first air discharge groove and the second air discharge groove. This intermediate passage allows air to flow between the two grooves, enabling the system to achieve effective air discharge even when the grooves are positioned offset from each other, thus resolving the positioning precision issue.
2Productivity
If the first air discharge groove and the second air discharge groove are machined precisely aligned, then air discharge efficiency is improved, but machining complexity and time increase
Solution Approach 1:
By segmenting the air discharge system into multiple grooves connected by an air passage, the design allows for simpler, more standardized machining operations on each individual groove rather than requiring complex precise alignment procedures, thereby reducing machining process complexity.
Solution Approach 2:
The air discharge grooves are arranged in different spatial dimensions and orientations (one on the upper surface, one on the side surface) rather than requiring linear alignment. This dimensional arrangement simplifies the machining process by allowing grooves to be created at convenient positions while the air passage groove bridges the spatial gap.
3Reliability
If precise alignment of air discharge grooves is required, then air discharge performance is optimized, but appearance defects and burrs increase
Solution Approach 1:
The segmentation of the air discharge groove into multiple parts connected by an air passage groove eliminates the need for precise linear alignment, thereby reducing machining errors that cause appearance defects and burrs while maintaining effective air discharge performance.
Solution Approach 2:
The air passage groove acts as a mediator that connects the first and second air discharge grooves, allowing them to be positioned at offset locations without compromising air discharge performance. This eliminates the need for precise alignment that would otherwise cause appearance defects and burrs.
Data Source
AI summary
A brake apparatus for a vehicle according to an aspect of the present invention, the brake apparatus for a vehicle including a brake pad configured to pressurize a brake disc, a screw bar positioned inside a caliper body and rotated by receiving power from a motor part, a piston configured to pressurize the brake pad, and a nut rectilinearly moved due to a rotation of the screw bar, positioned inside the piston, and provided with a plurality of air discharge grooves, which are disposed to be spaced apart from each other to discharge air present inside the piston, and an air passage groove which connects the plurality of air discharge grooves.