Brake Hydraulic Pressure Control Unit Sealing Design
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Solution Overview
Problem
Existing vehicle brake hydraulic pressure control units face issues with chippings produced during the press-fitting of assembled parts, which can mix with brake fluid, increase sliding resistance, and wear the seal portions.
Innovation Solution
A vehicle brake hydraulic pressure control unit design that includes a base body with a mounting hole portion featuring a bottom sealing surface and inner circumferential sealing surface, and assembled parts with lower end and outer circumferential sealing portions to create a hermetic accommodation space, preventing chippings from entering the brake fluid flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lower end portion of the electromagnetic valve is press fitted in the lower portion of the mounting hole portion, then the electromagnetic valve is securely fixed in place, but fine chippings (metallic ones) are produced in the lower portion of the mounting hole portion
Solution Approach 1:
The mounting hole portion is divided into multiple functional zones: an upper portion for guiding and initial insertion, a middle portion with locking grooves for secure fixation, and a lower portion for final seating. This segmentation allows the press-fitting process to occur in controlled stages, reducing chippings generation while maintaining fixation reliability.
Solution Approach 2:
The upper portion of the mounting hole portion is designed to guide the electromagnetic valve during initial insertion, ensuring proper alignment before the press-fitting process begins. This preliminary guiding action prevents misalignment-induced chippings during the actual fixation process.
2Reliability
If the lower end portion of the electromagnetic valve is press fitted in the lower portion of the mounting hole portion, then the electromagnetic valve is securely fixed in place, but the chippings produced mix into brake fluid causing increased sliding resistance and seal wear
Solution Approach 1:
The harmful chippings are extracted from the brake fluid flow path by confining them to a specific containment zone in the lower portion of the mounting hole portion. This spatial separation ensures that chippings generated during press-fitting do not contaminate the brake fluid, preventing increased sliding resistance and seal wear.
Solution Approach 2:
The lower portion of the mounting hole portion acts as an intermediary containment zone that captures and isolates chippings. This intermediate structure serves as a barrier between the press-fitting process and the brake fluid, preventing direct contact between chippings and the hydraulic fluid.
3Reliability
If a plastically deformed portion is formed on a hole wall of the mounting hole portion by inserting a lower end portion of the electromagnetic valve into a lower portion of the mounting hole portion for clamping, then the electromagnetic valve is prevented from dislocation, but the same chippings production problem occurs
Solution Approach 1:
The locking function is separated from the press-fitting function. The middle portion of the mounting hole portion contains locking grooves that receive plastically deformed portions for anti-dislocation, while the lower portion is dedicated to final seating. This segmentation allows locking to occur without direct contact between the electromagnetic valve lower end and the hole wall, reducing chippings production.
Solution Approach 2:
The locking grooves are pre-formed in the middle portion of the mounting hole portion before the final press-fitting process. This preliminary preparation allows the plastically deformed portions to be formed in a controlled manner during the locking stage, rather than during the final seating stage, reducing chippings generation.
Data Source
AI summary
A vehicle brake hydraulic pressure control unit including a base body including a brake fluid flow path and a mounting hole portion having a bottom sealing surface and an inner circumferential sealing surface and an assembled part which is assembled into the mounting hole portion so as to communicate with the flow path. The assembled part includes a lower end sealing portion hermetically contacting with the bottom sealing surface of the mounting hole portion to form a lower side sealing portion and an outer circumferential sealing portion hermetically contacting with the inner circumferential sealing surface of the mounting hole portion to form a circumferential sealing portion. A hermetic accommodation space is defined by the lower side sealing portion and the circumferential sealing portion.