Gear Pump Tooth Top Sealing via Eccentric Spring Urging
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Solution Overview
Problem
Conventional gear pumps fail to achieve sufficient pressure at the initial stage of operation due to insufficient pressure difference between the high and low pressure sides of the pump chamber, leading to inadequate sealing and pressure increase.
Innovation Solution
A gear pump design featuring a drive shaft with an eccentric bearing member and a spring member that urges the drive shaft toward a tooth top seal surface, ensuring consistent contact and sealing between the gear tooth tops and the seal surfaces, even with minimal pressure difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gear pump relies on pressure difference between high pressure side and low pressure side to seal the tooth top of the gear, then the sealing ability is improved under normal operation, but the pressure increase capability deteriorates at the initial stage of driving when sufficient pressure difference cannot be obtained
Solution Approach 1:
The patent introduces an urging member that preliminarily urges the tooth top of the gear toward the seal surface before the pressure difference is sufficient. This preliminary action ensures that the tooth top maintains contact with the seal surface from the initial stage of driving, enabling both sealing and pressure increase capability to be achieved simultaneously without waiting for pressure difference to build up.
2Reliability
If the tooth top of the gear contacts the seal surface using pressure difference, then sealing is achieved under sufficient pressure, but the tooth top cannot sufficiently contact the seal surface when pressure difference is insufficient
Solution Approach 1:
The patent introduces an urging member as an intermediary that actively pushes the tooth top toward the seal surface. This intermediary mechanism compensates for insufficient pressure difference, ensuring consistent and sufficient contact between the tooth top and seal surface regardless of pressure conditions, thereby improving both sealing performance and contact consistency.
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 enhances the sealing ability and pressure increase capability of the gear pump, maintaining effective sealing and reducing friction, while preventing drive shaft inclination and seizing, thus improving brake performance and stability.
Implementation Method 1
an urging member arranged to urge the drive shaft toward the seal surface of the tooth top seal member
Implementation Method 2
a tooth top seal member including a seal surface abutted on the plate, and arranged to seal a tooth top of the gear
Data Source
AI summary
A gear pump includes: a drive shaft; a first gear; a second gear; a first plate disposed between the first gear and the second gear, and arranged to liquid-tightly seal the first surfaces of the first and second gear; a pair of second plates disposed, respectively, on the second surfaces of the first and second gears, and arranged to liquid-tightly seal the second surfaces of the first and second gears, each of the second plates including a tooth top sealing portion having a seal surface arranged to seal a tooth top of the first gear and a tooth top of the second gear, and to form a suction portion with the first plate and the second plate; and an urging member arranged to urge the drive shaft toward the seal surface of the tooth top sealing portion of one of the first and second plates.