Hydraulic Braking Air Bleeding Device
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Solution Overview
Problem
Existing hydraulic braking systems face challenges in air bleeding for the rear-hydraulic-pressure control device connected to the rear chamber of a master cylinder, as air can enter this sealed chamber during fluid supply and is difficult to discharge, requiring costly bleeder plugs and additional space.
Innovation Solution
The hydraulic braking system incorporates an air bleeding device that performs air bleeding in a state where working fluid is prevented from being supplied to the rear chamber, using a low-pressure source and an air bleeding path formed by an electromagnetic valve controller, allowing air to be discharged before hydraulic pressure reaches supply start pressure, and includes a method to determine air presence based on hydraulic pressure changes in an accumulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air bleeding is performed after working fluid is supplied to the rear chamber, then the rear chamber can be pressurized, but air enters the sealed chamber and becomes difficult to discharge
Solution Approach 1:
The air bleeding operation is performed before working fluid is supplied to the rear chamber. The control valve is controlled to close the working fluid supply passage during air bleeding, preventing air from entering the sealed rear chamber when working fluid is subsequently supplied, thereby eliminating the need for complex bleeder plugs
Solution Approach 2:
The control valve prevents air from entering the rear chamber by closing the working fluid supply passage during air bleeding operations. This preliminary protective action stops the harmful effect of air contamination before it can occur, avoiding the need for additional air discharge mechanisms
2Reliability
If a bleeder plug is provided to discharge air from the rear chamber, then air can be removed from the sealed chamber, but processing cost and component cost increase
Solution Approach 1:
The air bleeding function is extracted from the rear chamber system and performed separately on the working fluid supply passage before fluid enters the chamber. This eliminates the need for a bleeder plug on the rear chamber, reducing processing costs and component requirements while maintaining air removal capability
Solution Approach 2:
Air is bled from the working fluid supply passage before the working fluid enters the rear chamber. This preliminary air removal action prevents air from entering the sealed chamber in the first place, eliminating the need for expensive bleeder plugs and additional processing
3Reliability
If a bleeder plug is provided to discharge air from the rear chamber, then air can be removed from the sealed chamber, but additional space is required
Solution Approach 1:
The air bleeding function is extracted from the rear chamber and performed on the supply passage instead. This eliminates the need for a bleeder plug and its associated space requirements, while maintaining the ability to remove air from the system before fluid enters the chamber
Solution Approach 2:
Air bleeding is performed preliminarily on the working fluid supply passage before fluid enters the rear chamber. This approach uses existing passage space for air removal rather than requiring additional space for a bleeder plug, thereby reducing overall space requirements
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 approach effectively discharges air from the rear-hydraulic-pressure control device without supplying air-contained working fluid to the rear chamber, reducing costs and complexity by performing air bleeding before hydraulic pressure increases, ensuring efficient air removal and maintaining system integrity.
Implementation Method 1
the pump device is actuated. Working fluid is pumped up from the reservoir and discharged by the pump
Implementation Method 2
an air bleeding path formed by an electromagnetic valve controller
Implementation Method 3
a rear-hydraulic-pressure control device connected to the rear chamber and configured to supply control hydraulic pressure to the rear chamber
Data Source
AI summary
A hydraulic braking system includes: a master cylinder including: a pressurizing piston fluid-tightly and slidably fitted in a housing; a front pressure chamber located in front of the pressurizing piston and connected to a brake cylinder; and a rear chamber located behind the pressurizing piston; a rear-hydraulic-pressure control device connected to the rear chamber of the master cylinder and configured to supply control hydraulic pressure to the rear chamber; and an air bleeding device configured to perform air bleeding for an air bleeding target portion as at least a portion of the rear-hydraulic-pressure control device, in a state in which working fluid is prevented from being supplied to the rear chamber.