Stepped-Bore Check Valve Assembly for Filtration and Air Bleeding
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Solution Overview
Problem
Conventional check valves in electronically controlled brake systems lack a filter member to prevent foreign substances from entering, leading to potential leaks and compromised sealing performance, and the integration of a filter member can cause damage during assembly and hinder air-bleeding operations.
Innovation Solution
A check valve structure with a filter member press-fitted into a bore of a modulator block, featuring a cylindrical body with mesh portions and support features, and a valve assembly that allows filtered oil to flow in one direction, preventing foreign substances and allowing for efficient air-bleeding by using a stepped bore design and a cap to seal the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter member is provided in a check valve, then foreign substances can be filtered, but the filter member may be deformed and damaged during assembly
Solution Approach 1:
The check valve assembly is divided into separate components: the filter member is installed independently in the valve body, and the valve core assembly is installed separately. This segmentation allows the filter member to be secured without requiring excessive compression force that would damage it, while still achieving the desired sealing performance through the separate valve core assembly.
Solution Approach 2:
The filter member is pre-installed and secured in the valve body before the valve core assembly is installed. This preliminary action ensures the filter member is properly positioned and protected from damage during subsequent assembly operations, while maintaining its filtering function for preventing sealing performance deterioration.
2Reliability
If a filter member is closely coupled with the check valve, then filtering is effective, but air-bleeding operation cannot be performed efficiently
Solution Approach 1:
The air bleeding function is extracted as a separate operational capability through the air bleeding hole in the valve body, independent of the filter member position. This allows the filter member to be closely coupled with the valve for effective filtering, while the air bleeding hole provides a separate pathway for efficient air removal during system setup.
Solution Approach 2:
The valve body serves as an intermediary structure that houses both the closely coupled filter member and the air bleeding hole. This intermediary design allows the filter member to be positioned close to the valve core for effective filtering, while simultaneously providing a separate air bleeding pathway that maintains operational efficiency during system setup.
3Reliability
If foreign substances enter the check valve, then sealing performance deteriorates, but without a filter member the valve housing is simpler
Solution Approach 1:
The valve is segmented into the valve body containing the filter member and the separate valve core assembly. This segmentation allows the filter member to be integrated into the valve body structure without complicating the valve core mechanism, maintaining reliable sealing performance while managing overall device complexity through modular design.
Solution Approach 2:
The valve body serves multiple functions: it houses the filter member for filtering foreign substances, contains the air bleeding hole for system setup, and provides the structural framework for the check valve mechanism. This multi-functionality reduces overall device complexity by consolidating multiple components into a single integrated valve body.
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
The solution effectively filters foreign substances, prevents filter member damage, and facilitates efficient air-bleeding operations during brake system setup, ensuring reliable one-way oil flow and maintaining check valve functionality.
Implementation Method 1
a filter member (110) configured to be press-fitted into the bore (13) to filter foreign substances contained in oil flowing in from the inflow passage (1)
Implementation Method 2
a spring (127) to elastically support the ball (125)
Implementation Method 3
the filter member (110) is press-fitted into the first bore (11) and the valve assembly (120) is press-fitted into the second bore (12)
Data Source
AI summary
Disclosed herein a check valve structure and a method of assembling the same. The check valve structure disposed in a bore of a modulator block having an inflow passage and a discharge passage to control one-way flow of oil includes a filter member configured to be press-fitted into the bore to filter foreign substances contained in oil flowing in from the inflow passage; and a valve assembly configured to be press-fitted into the bore to allow oil passing through the filter member to flow in a direction of the discharge passage; wherein the bore includes a first bore and a second bore having a diameter larger than that of the first bore, and the filter member is press-fitted into the first bore communicating with the inflow passage and the valve assembly is press-fitted into the second bore communicating with the discharge passage.