Gear Pump Tapered Fluid Communication for Noise Reduction
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Solution Overview
Problem
Conventional gear pumps experience noise due to gear rattling caused by rapid pressure variation in the fluid sealed in the tooth spaces between the drive and driven gears, leading to vibrations.
Innovation Solution
The introduction of tapered fluid communication portions between the partition surfaces and the suction side inner peripheral surface, which gradually widen the tooth spaces as the gears rotate, allowing the high-pressure discharge fluid to act on the fluid sealed in the tooth spaces, reducing rapid pressure variation and subsequent gear vibration noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the discharge chamber pressure is set higher than suction chamber pressure to enable fluid discharge, then the pump discharge capability is improved, but rapid pressure variation occurs in the fluid sealed in tooth spaces causing gear vibration and noise
Solution Approach 1:
The tapered fluid communication portions are provided in advance in the pump case, creating a gradual pressure transition path before the fluid is discharged. This preliminary structural arrangement allows the high-pressure discharge fluid to gradually compress the low-pressure fluid in the tooth spaces, preventing sudden pressure shocks and gear vibration while maintaining effective discharge capability.
2Ease of manufacture
If conventional straight fluid communication portions are used, then the manufacturing process is simple, but rapid pressure variation causes gear rattling and noise
Solution Approach 1:
The fluid communication portions are designed with tapered geometry instead of straight geometry, changing the spatial parameter of the communication path. This tapering creates a gradual area expansion that enables progressive pressure equalization, reducing noise while remaining compatible with conventional manufacturing processes like die casting or machining.
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 effectively suppresses noise caused by gear vibration without reducing pump discharge capability, while maintaining a simple and cost-effective manufacturing process by forming the tapered surfaces in the pump case, thus enhancing the performance of the gear pump.
Implementation Method 1
fluid communication portions are provided in connecting portions between the respective partition surfaces and the discharge side inner peripheral surface... cause tooth spaces surrounded by the wall surface portion and teeth of the gears positioned near the partition surface side of the connecting portions to communicate gradually with the discharge chamber
Data Source
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AI summary
In a gear pump according to the present invention, a wall surface portion of a casing (2) includes a drive side partition surface (41) on which tooth crests (11) of a drive gear (10) slide, a driven side partition surface (42) on which tooth crests (21) of a driven gear (20) slide, a suction side inner peripheral surface (43) that connects the drive side partition surface (41) and the driven side partition surface (42) on a suction chamber (3) side, and a discharge side inner peripheral surface (44) that connects the drive side partition surface (41) and the driven side partition surface (42) on a discharge chamber (4) side. Tapered portions (60) are provided in connecting portions between the respective partition surfaces (41, 42) and the discharge side inner peripheral surface (44) to cause tooth spaces (12, 22) surrounded by the wall surface portion of the casing (2) and teeth of the gears (10, 20) positioned near the partition surface (41, 42) side of the connecting portions to communicate gradually with the discharge chamber (4) as the gears (10, 20) rotate.