Vacuum Brake Booster Flow Control for Noise and Wear
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Solution Overview
Problem
Existing vacuum brake boosters rely on components susceptible to wear and contamination, such as air filters and elastic material valves, which impair their function and cause noise and vibration issues.
Innovation Solution
A vacuum brake booster design featuring a movable wall and a control valve unit with a guide sleeve and actuating piston, utilizing flow control portions to manage air flow without wear-prone components, allowing for adjustable flow channels to optimize air stream control and prevent noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If air filters or elastic material valves are used to control air flow, then air stream control is achieved, but wear and contamination occur leading to functional impairment
Solution Approach 1:
The invention removes the air filter component from the system. Instead of using a separate air filter that is susceptible to wear and contamination, the flow control portions integrated into the valve piston and guide sleeve perform the air stream control function directly, eliminating the need for the air filter and its associated maintenance issues.
Solution Approach 2:
The invention combines the air stream control function with the valve piston and guide sleeve components. The flow control portions are integrated directly into these components, merging multiple functions (valve operation and air flow control) into a single integrated structure, thereby eliminating separate wear-prone components.
2Object-affected harmful factors
If air filters or elastic material valves are used to control air flow, then noise and vibration are not prevented, but component wear leads to functional impairment
Solution Approach 1:
The invention removes the air filter component that was previously used for noise and vibration control. By eliminating this separate component and integrating its function into the flow control portions of the valve piston and guide sleeve, the system achieves noise and vibration prevention without relying on wear-prone parts.
Solution Approach 2:
The noise and vibration control function is merged with the valve operation components. The flow control portions integrated into the valve piston and guide sleeve simultaneously perform air flow control and noise/vibration suppression, eliminating the need for separate air filter components that are susceptible to wear.
3Reliability
If flow control portions are integrated into valve piston and guide sleeve, then components prone to wear are eliminated, but air stream control capability must be maintained
Solution Approach 1:
The invention merges the air stream control function with the valve piston and guide sleeve components. The flow control portions are integrated directly into these components, combining valve operation and air flow control in a single integrated structure, thereby maintaining control capability while eliminating separate wear-prone components.
Solution Approach 2:
The valve piston and guide sleeve components are designed to perform multiple functions: valve operation and air stream control. This multi-functionality allows the system to maintain air flow control capability while using fewer, more reliable components that are not susceptible to wear and contamination.
4Productivity
If flow channel cross section is increased during emergency braking, then air flow rate increases for rapid boost force, but normal operation flow control must be maintained
Solution Approach 1:
The invention employs dynamic flow control where the flow channel cross section can change based on operating conditions. During normal braking, the flow control portions maintain a controlled cross section for precise air flow regulation. During emergency braking, the cross section can increase to allow maximum air flow rates for rapid boost force generation, adapting to different operational requirements.
Solution Approach 2:
The invention changes the geometric parameters of the flow channel dynamically. The cross section of the flow channel is adjusted based on the braking situation - maintaining a controlled size during normal operation for precise flow control, and increasing during emergency braking to maximize air flow rate and boost force generation speed.
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 controls air flow to prevent noise and vibration while maintaining brake booster functionality, enabling reliable operation without components prone to wear or contamination, and rapidly increasing air flow during emergency braking to provide a strong boost force.
Implementation Method 1
an air stream can flow via the opening first valve seat on the actuating piston into the working chamber of the vacuum brake booster in order to build up a pressure difference between the working chamber, which is connected via the first valve seat to the atmosphere, and the vacuum chamber. Owing to this pressure difference, the movable wall moves in order to generate a boost force
Data Source
AI summary
A vacuum brake booster includes: at least one movable wall, which separates a working chamber and a vacuum chamber in the vacuum brake booster from one another, and a control valve unit, which is coupled to the at least one movable wall, the control valve unit comprising a guide sleeve and an actuation piston guided displaceably in the control valve unit, which actuation piston is actuatable by way of a force input member which can be coupled in particular to a brake pedal, the actuation piston having at least one first valve seat, which in the open state is used to connect the working chamber to the ambient atmosphere.