Piston Pump Airtight Mounting Part Seal Integration
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Solution Overview
Problem
Piston pumps for vehicle brakes require multiple high-pressure seals and complex assembly processes, increasing the number of parts and manufacturing costs due to the need for separate seals and spring cages.
Innovation Solution
A piston pump design that incorporates an airtight mounting part made of flexible material, serving as both a high-pressure seal and supporting the inlet spring, reduces the number of parts and assembly processes by integrating the seal function into the airtight mounting part, which is inserted between the sleeve and piston, and includes a check valve for efficient brake oil discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two high-pressure seals and a spring cage are separately provided, then the sealing reliability is improved, but the number of parts and manufacturing cost increase
Solution Approach 1:
The airtight mounting part combines multiple functions: it serves as a high-pressure seal, supports the inlet spring, and provides a mounting structure for the inlet ball. This integration eliminates the need for separate spring cages and multiple seals, reducing the total number of parts while maintaining sealing reliability under high pressure
Solution Approach 2:
The airtight mounting part is designed as a multi-functional component that simultaneously performs sealing, spring support, and ball mounting functions. This universal design allows a single part to replace what would traditionally require multiple separate components, simplifying the overall pump structure
2Reliability
If two high-pressure seals and a spring cage are separately provided, then the sealing function is improved, but the manufacturing cost increases
Solution Approach 1:
By merging the sealing function, spring support function, and mounting function into a single airtight mounting part, the manufacturing process is simplified. Fewer parts mean fewer manufacturing steps, less assembly work, and lower overall manufacturing costs while maintaining the required sealing performance
Solution Approach 2:
The multi-functional airtight mounting part reduces the bill of materials and assembly complexity, directly lowering manufacturing costs. The design achieves this by making one component perform the work of what would traditionally require multiple specialized parts
3Reliability
If the inlet ball is pressed toward the piston to leave a mark, then oil leakage is prevented, but the number of operation processes increases
Solution Approach 1:
The airtight mounting part is pre-designed with an integrated sealing structure and inlet spring mechanism that automatically presses the inlet ball against the piston surface during assembly. This preliminary design eliminates the need for separate marking operations, as the sealing action is built into the component structure itself
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 design reduces the number of parts and operation processes, lowers manufacturing costs, and enhances operational reliability by preventing oil leakage and simplifying assembly, while maintaining effective brake oil management.
Implementation Method 1
a return spring having both sides contacted with the sleeve and the airtight mounting part, and elastically pressing the airtight mounting part toward the motor cam
Implementation Method 2
an inlet ball pressed toward the piston by an inlet spring installed in the airtight mounting part
Implementation Method 3
a check valve installed at a position facing the sleeve, and configured to discharge brake oil in the sleeve to the outside of the sleeve when the pressure of the brake oil rises
Data Source
AI summary
A piston pump for a brake may include: a piston moved by rotation of a motor cam, and movably installed in a piston housing; a sleeve installed in a shape to cover an end of the piston, and having an inner space for storing brake oil moved from the piston; an airtight mounting part coupled to the end of the piston, and blocking brake oil from moving between the piston and the sleeve; a return spring having both sides contacted with the sleeve and the airtight mounting part, and elastically pressing the airtight mounting part toward the motor cam; an inlet ball pressed toward the piston by an inlet spring, and installed in contact with the airtight mounting part; and a check valve installed at a position facing the sleeve, and discharging brake oil to the outside of the sleeve when the pressure of the brake oil rises.