Pump Gear Tapered Hollow Structure for Noise Reduction
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Solution Overview
Problem
Pump gears with hollow portions and tapered surfaces in diesel engine supply pumps experience noise issues due to vibration transmission, as the focusing point of sound radiation is often located beyond the distal end of the hollow portion, leading to increased noise during operation.
Innovation Solution
A pump gear design where the tapered surface is configured such that the focusing point of sound radiation is positioned at the distal endmost or closer to the base end within the hollow portion, incorporating a cylindrical surface adjacent to the tapered surface and a tooth portion on the outer periphery, ensuring the focusing point remains inside the hollow portion to minimize noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hollow portion with a tapered surface is provided on the pump gear, then the structural integrity and mounting capability are improved, but vibration is transmitted to the inner peripheral surface and radiated as noise
Solution Approach 1:
The patent changes the geometric parameters of the tapered surface, specifically controlling the angle and dimensions so that the focusing point of sound radiation falls within the hollow portion rather than beyond it. This parameter optimization reduces noise radiation while preserving the structural benefits of the hollow portion.
2Strength
If the tapered surface extends toward the distal end, then the hollow portion provides better structural support, but the focusing point of sound radiation moves beyond the distal endmost position causing increased noise
Solution Approach 1:
The patent optimizes the dimensional parameters of the tapered surface, specifically controlling its axial length and angle, to position the sound radiation focusing point within the hollow portion. This resolves the contradiction by adjusting geometry to simultaneously maintain structural support and minimize noise.
3Length of stationary object
If the focusing point of sound radiation is positioned beyond the distal end of the hollow portion, then the tapered surface can be longer providing better structural support, but noise is increased
Solution Approach 1:
The patent changes the geometric parameters of the tapered surface to control where the sound radiation focusing point falls. By optimizing the angle and length, the focusing point is positioned within the hollow portion, achieving both adequate structural support and reduced noise.
4Weight of moving object
If the hollow portion is made deeper to reduce weight, then material usage is reduced, but vibration transmission and noise radiation increase
Solution Approach 1:
The patent optimizes the depth and geometric parameters of the hollow portion to achieve a balance between weight reduction and noise control. By carefully controlling the tapered surface dimensions, the focusing point is positioned within the hollow portion, allowing deeper hollow portions without excessive noise increase.
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 reduces noise by containing the focusing point of sound radiation within the hollow portion, preventing noise protrusion and enhancing operational quietness.
Implementation Method 1
vibration during driving transmitted from the teeth on an outer peripheral portion of the pump gear is transmitted to the inner peripheral surface of the hollow portion through the flesh of the pump gear and is radiated from the inner peripheral surface of the hollow portion
Data Source
AI summary
The pump gear to be mounted on an input shaft 3 of a supply pump 2 that pumps fuel has a hollow portion 8 that is open to a distal end side in an axial C direction and a tapered surface 9 that is formed on an inner peripheral surface of the hollow portion and gradually increases in diameter as it extends from a base end side toward the distal end side in the axial direction. The tapered surface is configured such that a focusing point F1 of sound radiation S1 radiating perpendicularly from a distal end portion in the axial direction 15 of the tapered surface is positioned at a distal endmost position P4 in the axial direction of the hollow portion or at a position closer to the base end side in the axial direction than the distal endmost position in the axial direction.