Master Cylinder Stroke Simulator Air Bleeding
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Solution Overview
Problem
Facilitation of air bleeding work in braking devices is desired, as existing systems face difficulties in efficiently removing air from the stroke simulator, particularly during power down scenarios, leading to potential pedal feel deterioration and increased complexity.
Innovation Solution
A master cylinder unit incorporating a stroke simulator with a simulator piston, biasing chamber, and seal members that allow brake fluid to flow from the simulator supply chamber to the biasing chamber, facilitating air bleeding by communicating with the reservoir and power module, and featuring a communication path that aligns the master and stroke simulator cylinders for efficient fluid introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stroke simulator is added to the master cylinder unit, then pedal feel and reaction force are improved, but air bleeding work becomes more difficult and system complexity increases
Solution Approach 1:
The stroke simulator is divided into separate functional chambers (simulator pressure chamber, biasing chamber, simulator supply chamber) with dedicated communication paths. This segmentation allows air bleeding to be performed independently in each chamber, simplifying the overall air bleeding process while maintaining the stroke simulator's pedal feel improvement function.
Solution Approach 2:
The simulator supply chamber acts as an intermediary chamber that connects the reservoir to both the simulator pressure chamber and biasing chamber. This intermediary structure provides a dedicated fluid introduction path for air bleeding operations, making the process easier while preserving the stroke simulator's functionality.
2Force
If the stroke simulator uses a complex chamber structure, then reaction force generation is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The simulator supply chamber serves multiple functions: it supplies brake fluid to the simulator pressure chamber during normal operation, provides a fluid introduction path for air bleeding, and communicates with the reservoir. This multi-functionality reduces the need for separate components, simplifying the overall structure while maintaining reaction force generation capability.
Solution Approach 2:
The biasing chamber is positioned within the stroke simulator assembly, with the simulator supply chamber nested between the simulator pressure chamber and biasing chamber. This nested arrangement consolidates multiple chambers into a compact structure, reducing device complexity while preserving the reaction force generation function.
3Volume of moving object
If the master cylinder and stroke simulator are integrated, then space efficiency is improved, but air bleeding efficiency deteriorates
Solution Approach 1:
The integrated unit is segmented into distinct communication paths: one path from the reservoir through the simulator supply chamber to the simulator pressure chamber, and another path to the biasing chamber. This segmentation enables efficient air bleeding from both chambers simultaneously or independently, maintaining high air bleeding efficiency while preserving space efficiency through integration.
Solution Approach 2:
The simulator supply chamber serves as an intermediary that facilitates efficient fluid introduction during air bleeding operations. By positioning this chamber to communicate with both the simulator pressure chamber and biasing chamber, the design enables rapid air removal from both chambers while maintaining the compact integrated structure.
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 simplifies air bleeding by allowing direct fluid introduction into the spring chamber, reducing negative pressure and pedal stroke variability, thereby improving air bleeding efficiency and reducing system complexity and cost.
Implementation Method 1
a second seal member which partitions the simulator supply chamber and the biasing chamber and allows the brake fluid to flow from the simulator supply chamber to the biasing chamber when a pressure difference occurs between the simulator supply chamber and the biasing chamber
Implementation Method 2
a biasing chamber in which a biasing mechanism biasing the simulator piston against the introduced fluid pressure is disposed on the other end side of the simulator piston inside the simulator cylinder
Data Source
AI summary
Provided is a master cylinder unit including a simulator pressure chamber which communicates with a pressure chamber of a master cylinder and moves a simulator piston by means of an introduced fluid pressure; a biasing chamber in which a biasing mechanism biasing the simulator piston against a fluid pressure introduced into the simulator pressure chamber is disposed; a first seal member which partitions a simulator supply chamber, the simulator supply chamber, and the simulator pressure chamber communicating with a master supply chamber; and a second seal member which partitions the simulator supply chamber and the biasing chamber and allows a brake fluid to flow from the simulator supply chamber to the biasing chamber when a pressure difference occurs between the simulator supply chamber and the biasing chamber.