Nested Brake Master Pump Dual-Core Structure for Lower Seal Friction
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Solution Overview
Problem
Existing brake upper pumps face issues such as increased friction resistance, wear and tear, oil leakage, and poor braking feel due to larger piston seals and springs, leading to high maintenance costs and inconsistent braking performance.
Innovation Solution
A nested brake upper pump with a dynamic and static dual-core structure, featuring a fixed piston cylinder sleeve and movable piston push rod assembly with reduced sealing ring size and independent components, optimizing braking feel and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the size of the piston seal is enlarged to increase the unit stroke oil push volume, then the braking force is improved, but the friction resistance between the piston seal and inner wall increases, causing wall-hitting feel
Solution Approach 1:
The piston seal is divided into multiple independent sealing rings with different sizes and positions. The first sealing ring has a smaller diameter than the piston seal, reducing friction resistance, while the second sealing ring provides additional sealing. This segmentation allows the system to maintain braking force through multiple seals while reducing the friction of any single seal.
Solution Approach 2:
Different sealing rings are designed with different local properties - the first sealing ring has a smaller diameter to reduce friction in the critical area, while the second sealing ring provides enhanced sealing capability. This local differentiation allows optimization of both friction reduction and sealing performance in specific regions rather than uniformly increasing all seal dimensions.
2Reliability
If a piston spring with greater elasticity is used to enable automatic reset, then the reset function is improved, but the boost feel becomes hard and user experience deteriorates
Solution Approach 1:
The spring system is segmented into multiple springs with different characteristics positioned at different locations. This allows the reset function to be distributed across multiple smaller springs rather than relying on a single large spring, reducing the harshness of the reset force while maintaining reliable automatic reset functionality.
3Force
If the size of the brake lower pump is enlarged to obtain greater braking force, then the braking performance is improved, but the size of the piston chamber and piston push rod in the brake upper pump must be enlarged, increasing overall system size
Solution Approach 1:
The piston push rod assembly is nested within the piston chamber, with the push rod containing the sealing rings positioned inside the chamber. This nested arrangement allows the components to occupy shared space efficiently, enabling the system to achieve the required braking force without proportionally increasing the overall piston chamber volume.
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
Enhances braking performance with reduced friction and maintenance costs by using smaller sealing rings and independent components, ensuring stable operation and smoother movement.
Implementation Method 1
a piston spring with greater elasticity is required (for example, the wire diameter of the spring is increased), which will cause new defects
Implementation Method 2
the larger the piston seal, the greater the friction resistance formed between it and the inner wall
Data Source
AI summary
Provided herein is a nested brake upper pump with a dynamic and static dual-core structure including a brake pump body provided with an oil chamber; a piston push rod assembly; a brake handle. The piston push rod assembly includes: a fixed piston cylinder sleeve having a cylinder sleeve through hole and forming a large diameter section and a small diameter section in the oil chamber; a moving piston push rod movably arranged in the oil chamber. The moving piston push rod includes an oil pushing section and a transmission section at least partially penetrated in the cylinder sleeve through hole; a large diameter piston oil seal located in the large diameter section; a small diameter piston oil seal located in the small diameter section; a fixed sealing ring sleeved on the outer wall of the fixed piston cylinder sleeve.