Pump Gear Shaft Sealing via Pressing Force
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Solution Overview
Problem
Conventional pump apparatuses face challenges in achieving high accuracy in gear shaft positioning while maintaining assembling efficiency, often resulting in clearance issues that lead to undesirable displacement and leakage, which reduces pump efficiency.
Innovation Solution
The pump apparatus incorporates shaft seal members that apply a pressing force between the tooth tips of gears and seal surfaces, ensuring contact between the inner circumferential surfaces of bearings and the outer circumferential surfaces of shafts, even with relatively low dimensional accuracy, using a clearance reducing mechanism and integral seal members to enhance assemblability and reduce leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dimensional accuracy of parts is excessively enhanced to achieve high positioning accuracy, then positioning accuracy of gear shafts is improved, but assembling efficiency is lowered
Solution Approach 1:
The patent introduces pressing means as an intermediary mechanism between the gear shafts and bearing holes. This pressing means actively compensates for clearance by applying pressing force, thereby eliminating the need for excessively high dimensional accuracy in the parts themselves. The intermediary mechanism resolves the contradiction by providing positioning accuracy through active force application rather than passive precision manufacturing.
2Productivity
If dimensional accuracy of parts is reduced to improve assembling efficiency, then assembling efficiency is improved, but clearance occurs between gear shafts and bearing holes causing displacement and leakage
Solution Approach 1:
The patent applies preliminary anti-action by using pressing means to preemptively counteract the harmful effects of clearance before leakage can occur. The pressing force is applied in advance to maintain contact between gear tooth tips and seal surfaces, preventing the displacement and leakage that would otherwise result from clearance. This allows parts with lower dimensional accuracy to be assembled efficiently while maintaining reliable sealing performance.
3Reliability
If pressing force is applied between gear tooth tips and seal surfaces, then displacement is suppressed and sealing is improved, but bearing contact may be compromised
Solution Approach 1:
The patent applies local quality by differentiating the functions of different regions of the gear shaft system. The pressing means is specifically positioned to apply force in the closing region where gear tooth tips contact seal surfaces, while deliberately avoiding interference with the bearing contact regions. This localized application of pressing force maintains sealing performance without compromising bearing contact stability.
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 configuration ensures reliable contact between gear tooth tips and seal surfaces, suppressing displacement and increasing pump efficiency by maintaining contact between bearings and shafts, thus improving assembling efficiency and reducing fluid leakage.
Implementation Method 1
shaft seal members that apply a pressing force between the tooth tips of gears and seal surfaces
Data Source
AI summary
A pump apparatus including a drive shaft and a driven shaft supported by bearing members, respectively, a center plate, first external gears, second external gears, first and second side plates, first and second seal members, a pressing means for applying a pressing force between the tooth tips of the respective external gears and the seal surface of the respective seal members in a closing region disposed between the respective external gears and the respective seal members, wherein contact between inner circumferential surfaces of the bearing members and an outer circumferential surface of the drive shaft is established on the side of the closing region, while the tooth tips of the respective external gears and the seal surface of the respective seal members in the closing region are kept pressed against each other by the pressing means.