Variable Displacement Vane Pump Rib Configuration

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Solution Overview

Problem

Existing variable displacement vane pumps experience fluctuations in discharge rate due to inadequate design features that fail to effectively manage hydraulic fluid pressure pulsations.

Innovation Solution

The pump is configured such that the first rib within the high-pressure chamber, closest to the discharge passage opening, does not face the communication hole of the pressure plate, which helps in reducing pressure pulsations and stabilizing the discharge rate by ensuring a single flow path and sufficient straightening effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the first rib is positioned to face the communication hole, then the discharge rate increases, but the discharge rate fluctuation worsens

Engineering Contradiction:

Improvedischarge rateVSAvoiddischarge rate fluctuation

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent extracts the harmful interaction between the first rib and communication hole by positioning the first rib to not face the communication hole. This eliminates the direct alignment that causes pressure pulsations and discharge rate fluctuations, while maintaining sufficient discharge rate through proper positioning of other ribs and communication holes.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces asymmetric positioning of ribs relative to communication holes. Specifically, the first rib is positioned asymmetrically so it does not face the communication hole directly, creating an optimized flow path that reduces pressure pulsations while maintaining discharge performance.

Inventive Principle:

Principle #4Asymmetry

2Stability of the object's composition

If multiple ribs are added to straighten hydraulic fluid, then pressure pulsation reduction improves, but device complexity increases

Engineering Contradiction:

Improvepressure pulsationVSAvoidrib structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent applies local quality by positioning ribs at specific locations within the high-pressure chamber rather than uniformly distributing them. The first rib is strategically positioned to not face the communication hole, while other ribs are arranged to provide sufficient straightening effect. This localized optimization reduces pressure pulsations without requiring excessive ribs throughout the entire chamber.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses a moderate number of ribs with optimized positioning rather than excessive ribs. The first rib's specific positioning combined with other ribs provides sufficient straightening effect to reduce pressure pulsations, avoiding the need for too many ribs that would increase device complexity.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10947971B2Variable displacement vane pump

Publication Date: 2021.03.16 ASTEMO LTD

AI summary

Provided is a variable displacement vane pump which is capable of reducing fluctuation in discharge rate. In the variable displacement vane pump, a first straightening vane 33 closest to one end-side opening 14a of a discharge passage 14 among a plurality of straightening vanes 33, 34 and 35 arranged within the discharge pressure chamber 202 is located so as not to face a communication hole 32 of a pressure plate 2c.