Automobile Inflatable Pump Piston Sealing Structure
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Solution Overview
Problem
The existing automobile inflatable pump piston requires a complex two-way seal structure with multiple components, leading to high production costs and poor reliability due to the prone failure of the valve disc.
Innovation Solution
A simplified sealing structure using a single sealing ring that is elastically deformed by air pressure changes to control air inlet holes, eliminating the need for a valve disc and reducing assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-way seal structure with sealing ring and valve disc is adopted, then sealing function is achieved, but device complexity and production cost increase
Solution Approach 1:
The patent merges the sealing function and valve control function into a single sealing ring component. The sealing ring is provided with a sealing surface that abuts against the piston under positive pressure to seal the air inlet holes, eliminating the need for a separate valve disc. This consolidation reduces the number of parts and assembly steps while maintaining both sealing and air control functions.
Solution Approach 2:
The sealing ring is designed to perform multiple functions: it provides sealing between the piston and cylinder block, and simultaneously controls the opening and closing of air inlet holes through its sealing surface that abuts against the piston. This multi-functional design replaces the traditional separate sealing ring and valve disc, simplifying the overall structure.
2Ease of operation
If a two-way seal structure with valve disc is adopted, then air inlet control is achieved, but production cost increases due to multiple manufacturing processes
Solution Approach 1:
The patent combines the air inlet control function previously performed by the valve disc with the sealing ring. The sealing ring's sealing surface abuts against the piston when front cavity pressure exceeds rear cavity pressure, thereby controlling the air inlet holes. This merger reduces the number of manufactured parts and assembly operations, lowering production costs.
3Ease of operation
If a two-way seal structure with valve disc is adopted, then air inlet control is achieved, but operational reliability decreases due to valve disc failure
Solution Approach 1:
The patent eliminates the valve disc component by merging its air inlet control function into the sealing ring. The sealing ring, which is already a robust component designed for sealing, now also controls air inlet by abutting its sealing surface against the piston under pressure. This removes the valve disc failure mode and improves overall system reliability.
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 reduces production costs, improves operational reliability, and simplifies the assembly process while maintaining effective sealing and air control during the inflation process.
Implementation Method 1
a second sealing surface being defined in a rear end surface of the sealing ring... when a pressure of the front cavity is greater than that of the rear cavity, the second sealing surface is abutted against the first sealing surface in a sealed manner
Data Source
AI summary
The invention relates to an automobile inflatable pump comprising: a driving assembly; a rocker arm, a rear end of which is mounted on a power output end of the drive assembly; a cylinder block connected to the drive assembly and defining a piston cavity inside; a piston provided on a front end of the rocker arm, the piston being movably received in the piston cavity to divide the piston cavity into a front cavity having an inflation inlet and a rear cavity communicating with the external environment, the drive assembly driving the rocker arm to rotate, thus the piston moves back and forth in a straight line; and a sealing ring provided in the first annular groove, a front end of the sealing ring protruding at least in part beyond the outer peripheral wall of the piston. The invention has beneficial effects of simplified structure, improved production efficiency, and reduced costs.