Oil Pump Resonator Alignment for Pulsation Damping

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Solution Overview

Problem

Conventional oil pumps struggle to effectively absorb pulsation vibrations caused by dynamic pressure at the discharge port, leading to increased noise and unwanted effects on devices due to the difficulty in introducing dynamic pressure into the oil chamber, which is positioned sideways and perpendicular to the flow direction.

Innovation Solution

An oil pump design featuring a resonator with an introduction path aligned in the same direction as the discharge flow channel, where the introduction path is positioned frontward and narrower than the discharge flow channel, allowing for effective absorption of dynamic pressure pulsations into a chamber, reducing hydraulic pulses and noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the oil chamber is arranged sideways and perpendicular to the flow direction with a communication hole formed vertically, then the structure is compact and easy to manufacture, but the dynamic pressure pulsation cannot be effectively absorbed

Engineering Contradiction:

Improveease of manufactureVSAvoidpulsation vibration

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The invention inverts the conventional communication hole arrangement from a vertical orientation (perpendicular to flow) to a horizontal orientation (aligned with flow direction). By forming the communication hole in the flow direction of the discharge port, the dynamic pressure pulsation can directly enter the oil chamber, transforming the harmful pulsation into a useful function for stabilizing oil flow and reducing vibration.

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If the communication hole is provided at right angles to the flow direction of oil, then the oil chamber can be positioned in parallel with the discharge port, but direct introduction of dynamic pressure into the oil chamber becomes difficult

Engineering Contradiction:

Improveease of operationVSAvoidreliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention changes the communication hole orientation from perpendicular to parallel with the flow direction, enabling direct introduction of dynamic pressure pulsation into the oil chamber. This inversion allows the system to reliably absorb pulsation vibrations while maintaining ease of operation through straightforward structural integration.

Inventive Principle:

Principle #13The other way round (Inversion)

3Device complexity

If the oil chamber is positioned in the lateral direction of the discharge port, then the structure is simplified, but adequate pulsation reduction cannot be achieved

Engineering Contradiction:

Improvedevice complexityVSAvoidpulsation vibration

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The invention maintains the simplified lateral positioning of the oil chamber relative to the discharge port but inverts the communication hole orientation from vertical to horizontal. This allows the oil chamber to remain in a simplified position while effectively absorbing dynamic pressure pulsation, thus reducing vibration without increasing device complexity.

Inventive Principle:

Principle #13The other way round (Inversion)

4Device complexity

If the communication hole introduces only static pressure, then the structure is simple, but the dynamic pressure pulsation load on devices and pipe members cannot be reduced

Engineering Contradiction:

Improvedevice complexityVSAvoiddynamic pressure load

Core Design Contradiction:

Device complexityVSForce

Solution Approach 1:

The invention inverts the pressure introduction mechanism by aligning the communication hole with the flow direction, enabling dynamic pressure pulsation to directly enter the oil chamber. This simple structural change allows the system to absorb both static and dynamic pressure components, reducing the harmful dynamic pressure load on devices and pipe members without increasing complexity.

Inventive Principle:

Principle #13The other way round (Inversion)

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 design significantly reduces pulsation vibrations and noise by aligning the introduction path with the flow direction, allowing for efficient absorption of dynamic pressure into the chamber, thereby stabilizing oil flow and minimizing its impact on connected devices.

Implementation Method 1

a resonator configured from an introduction path and a chamber is formed with respect to a discharge flow channel

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

absorption of pulsation due to dynamic pressure in the discharge port is hard to achieve

Methodology Applied

Scientific EffectAcoustic absorption: Acoustic Absorption

Data Source

PatentUS7845920B2Oil pump

Publication Date: 2010.12.07 HONDA MOTOR CO LTD

AI summary

An oil pump in which pulsation vibration due to the dynamic pressure on the discharge port side can be attenuated. In an oil pump for transporting fluid from a suction port to a discharge port by the rotation of a rotor mounted in a pump casing, a resonator configured from an introduction path and a chamber is formed with respect to a discharge flow channel that communicates with the discharge port in the flow direction of the discharge flow channel. A channel in a direction different to the flow direction of the discharge flow channel is communicatingly formed in the vicinity of the resonator.