Vacuum Brake Booster Flow Regulating Wall Curvature
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Solution Overview
Problem
Existing vacuum brake boosters suffer from response lag and operation noise due to turbulent air flow in the axial and radial passages, which is not adequately addressed by previous designs.
Innovation Solution
The improved vacuum brake booster incorporates a flow regulating wall and specific passage configurations, including a cylindrical inner passage and outer passages formed by arc-like regulating walls, to manage air flow and prevent turbulent flow between the valve body and plunger, ensuring smooth air flow and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If atmospheric air flows through the axial passage and radial passage when the air valve is open, then the variable pressure chamber is pressurized, but turbulent flow occurs causing response lag and operation noise
Solution Approach 1:
The patent applies curvature by forming the axial passage with an arc-like shape instead of a straight configuration. Specifically, the axial passage includes a first axial passage portion and a second axial passage portion that are connected via an arc-like curvature, allowing atmospheric air to flow smoothly from the air valve through both portions into the variable pressure chamber. This curved configuration eliminates sharp corners and abrupt direction changes that would cause turbulent flow, thereby preventing operation noise and response lag while maintaining effective pressurization of the variable pressure chamber.
2Productivity
If atmospheric air flows through the axial passage and radial passage when the air valve is open, then the variable pressure chamber is pressurized, but turbulent flow occurs causing response lag
Solution Approach 1:
The patent applies curvature by forming the axial passage with an arc-like shape instead of a straight configuration. Specifically, the axial passage includes a first axial passage portion and a second axial passage portion that are connected via an arc-like curvature, allowing atmospheric air to flow smoothly from the air valve through both portions into the variable pressure chamber. This curved configuration eliminates sharp corners and abrupt direction changes that would cause turbulent flow, thereby preventing operation noise and response lag while maintaining effective pressurization of the variable pressure chamber.
3Productivity
If air flows from the variable pressure chamber to the vacuum chamber through the radial passage and axial passage when the vacuum valve is open, then the vacuum chamber is evacuated, but turbulent flow may occur
Solution Approach 1:
The patent applies curvature by forming the axial passage with an arc-like shape instead of a straight configuration. Specifically, the axial passage includes a first axial passage portion and a second axial passage portion that are connected via an arc-like curvature, allowing atmospheric air to flow smoothly from the air valve through both portions into the variable pressure chamber. This curved configuration eliminates sharp corners and abrupt direction changes that would cause turbulent flow, thereby preventing operation noise and response lag while maintaining effective pressurization of the variable pressure chamber.
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 effectively prevents turbulent air flow, reducing response lag and operation noise, while maintaining a good responsive property and ensuring a desired sealing condition, thus enhancing the performance of the vacuum brake booster.
Implementation Method 1
a flow regulating wall formed in the valve body, a cylindrical inner passage formed at the outer circumference of the plunger by the flow regulating wall and an inner circumferential wall portion of a passage forming wall which forms the vacuum passage; and an outer passage formed at the outer circumference of the inner passage by the flow regulating wall and circumferential end walls of the passage forming wall
Data Source
AI summary
A vacuum brake booster includes a movable wall forming a vacuum chamber and a variable pressure chamber in a housing and a valve body connected to the movable wall. A valve mechanism having a vacuum valve for establishing or interrupting the communication between both chambers corresponding to the movement of a plunger and having an air valve for establishing or interrupting the communication between the variable pressure chamber and atmosphere are disposed in an axial hole of the valve body. Atmosphere after the air valve passed flows into the variable pressure chamber through an axial passage and a radial passage formed in the valve body. The axial passage is constituted by a cylindrical inner passage formed at the outer circumference of the plunger by an arc-like flow regulating wall and an arc-like inner circumferential wall portion and an outer passage formed at the outer circumference of the inner passage.