Pneumatic Brake Booster Ventilation Ducts
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Solution Overview
Problem
Existing pneumatic brake boosters have suboptimal response and release characteristics due to inefficient ventilation and bleeding processes, which affect the rapidity of the working chamber's ventilation and bleeding.
Innovation Solution
The design includes two bleeding ducts and two ventilating ducts that cover the entire circular cross-section of the control housing, with ventilating ducts interrupted by minimal webs to maximize flow cross-section, arranged diametrically opposite and distributed symmetrically, and extending axially over the length of bleeding ducts, along with a cylindrical sleeve to minimize assembly complexity and damage, and offset connecting channels for economical manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the ventilating ducts are interrupted by webs to accommodate the transverse member, then the structural stability is improved, but the flow cross-section is reduced
Solution Approach 1:
The ventilating ducts are interrupted only by the smallest possible cross-section of the webs, providing just enough structural support while minimizing the impact on flow cross-section. This partial interruption approach balances structural requirements with flow optimization.
2Area of stationary object
If the ventilating ducts extend axially over the length of the bleeding ducts, then the flow cross-section is increased, but the device complexity increases
Solution Approach 1:
The ventilating ducts are merged with the bleeding ducts by extending them axially over the same length and arranging them symmetrically. This integration increases the effective flow cross-section while using the same structural framework, thereby avoiding additional complexity.
3Ease of operation
If the reaction element and head flange are arranged in a sleeve, then the ease of assembly is improved, but the manufacturing precision requirements increase
Solution Approach 1:
A cylindrical sleeve is introduced as an intermediary component to hold the reaction element and head flange. This sleeve simplifies assembly by providing a pre-assembled unit that can be installed as one piece, while the precision requirements are concentrated in the sleeve manufacturing rather than the overall assembly.
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 configuration enhances the response and release dynamics by increasing flow cross-sections, improving air flow, and simplifying assembly while allowing for efficient manufacturing, thereby improving the brake booster's performance and ease of assembly.
Implementation Method 1
a pneumatic differential pressure can be applied to a movable wall (12, 13) which can be moved in an axial direction
Implementation Method 2
an elastic reaction element (27), which cooperates with the input member (18) and with the output member (31)
Implementation Method 3
ventilating and bleeding ducts, which are provided in the control housing and allow evacuating and ventilating the working chamber
Data Source
AI summary
A pneumatic brake booster for motor vehicles includes a booster housing, subdivided into at least one working chamber and at least one vacuum chamber by at least one axially movable wall to which a pneumatic differential pressure can be applied, a control valve controlling the differential pressure and arranged in a control housing to connect the working chamber to the vacuum chamber or atmosphere, the valve having two concentrically arranged sealing seats and an elastically deformable valve member, an operable input member connected to a valve piston whose movement is limited by a transverse member that can be introduced in a radial direction into the control housing, an elastic reaction element, an output member applying a boosting force to a master cylinder, and ventilating and bleeding ducts in the control housing.