Electric Vacuum Pump Connecting Rod Pin-Bushing Wear Control
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Solution Overview
Problem
Current electric vacuum pump connecting rod structures suffer from low strength, poor wear resistance, and short lifetime due to issues like jamming and wear caused by impurities entering clearances, making them difficult to manufacture and assemble, and unable to withstand large axial forces.
Innovation Solution
A connecting rod structure featuring a pin with a shank, neck, and cap, a sintered copper bushing with a graphite extension, and a dust-proof sleeve, which prevents impurities from entering the clearance and enhances wear resistance, allowing for easy assembly and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connecting rod structure with pin and bushing is used, then wear resistance and lifetime are improved, but manufacturing complexity increases
Solution Approach 1:
The connecting rod structure is divided into separate components: pin, bushing, and connecting rod body. This segmentation allows each part to be manufactured independently with optimized processes, then assembled together, improving wear resistance through specialized bushing materials while maintaining manufacturing feasibility through modular production
Solution Approach 2:
The bushing is made from composite materials (such as sintered bronze or aluminum alloy with special coatings) that provide superior wear resistance compared to traditional single-material connecting rods. This material selection directly addresses the wear resistance requirement while the modular design keeps manufacturing manageable
2Ease of operation
If clearance fit is used between pin and bushing, then ease of assembly is improved, but jamming due to impurities occurs
Solution Approach 1:
A dust-proof sleeve is introduced as an intermediary component between the pin and bushing clearance. This sleeve acts as a barrier that prevents impurities from entering the clearance space, allowing the use of clearance fit for easy assembly while eliminating the jamming problem that would otherwise result from contaminant ingress
3Strength
If interference fit is used between shank and connecting rod, then strength is improved, but manufacturing precision requirements increase
Solution Approach 1:
The interference fit parameters (interference amount, surface roughness, material properties) are carefully selected and controlled within specific ranges. By optimizing these parameters, the design achieves sufficient connection strength while keeping manufacturing precision requirements at practical, achievable levels through standardized machining processes
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 structure prevents jamming and wear, ensures easy manufacturing and assembly, withstands large axial forces, and reduces detachment risks, extending the lifetime of the connecting rod and vacuum pump.
Implementation Method 1
a bushing sleeved around the neck... The bushing may be a sintered copper bushing, prolonging the lifetime of the connecting rod structure
Data Source
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AI summary
The present application provides a connecting rod structure for an electric vacuum pump and an electric vacuum pump. The connecting rod structure for an electric vacuum pump includes: a connecting rod, a proximal end of the connecting rod being configured for a motor shaft to pass through, and a distal end of the connecting rod being configured for connection with a piston; a pin including a shank, a neck and a cap which are connected in sequence, the shank being connected to the distal end of the connecting rod; and a bushing sleeved around the neck. The connecting rod structure for an electric vacuum pump according to the present application prevents, by means of the fitting between the pin and the bushing, jamming or wear due to impurities entering a clearance therebetween, and has advantages such as ease of manufacturing and assembly, capability of withstanding large axial forces, and rare chances for the pin to be detached during the swinging of the connecting rod. Further, the bushing may be a sintered copper bushing, prolonging the lifetime of the connecting rod structure.