Electric Oil Pump Check Valve Without a Return Spring

Solution Overview

Problem

Existing electric oil pumps with check valves often require complex designs and additional components, such as valve springs, which can increase manufacturing costs and complexity, while also potentially leading to damage or destruction of motor electronics due to backflow.

Innovation Solution

The proposed electric oil pump incorporates a G-rotor design with a check valve that does not require a valve spring, featuring a ball closing body and a grid- or cage-like closing body holder that provides a sufficient flow cross-section and reliable sealing without additional components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a check valve with valve spring is used to prevent backflow, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvebackflow preventionVSAvoidvalve structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention extracts and removes the valve spring from the check valve structure, retaining only the essential components (closing body, holder, and seat). This simplification eliminates the complex spring mechanism while maintaining the core backflow prevention function through the weight and magnetic force of the closing body alone.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The closing body serves dual functions: it prevents backflow by sealing against the valve seat while simultaneously providing its own actuation mechanism through its weight and magnetic interaction. The valve operates autonomously without requiring external spring components to return the closing body to its sealing position.

Inventive Principle:

Principle #25Self-service

2Reliability

If a valve spring is added to the check valve, then sealing reliability is improved, but manufacturing cost increases

Engineering Contradiction:

ImprovesealingVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention extracts and removes the valve spring from the check valve structure, retaining only the essential components (closing body, holder, and seat). This simplification eliminates the complex spring mechanism while maintaining the core backflow prevention function through the weight and magnetic force of the closing body alone.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the expensive valve spring with simpler, cheaper components - a closing body made from inexpensive materials that can be easily manufactured. The simplified structure with fewer parts reduces manufacturing complexity and cost while maintaining adequate sealing performance.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If a complex check valve design is used, then backflow prevention is improved, but ease of operation worsens

Engineering Contradiction:

Improvebackflow preventionVSAvoidinstallation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The check valve is segmented into distinct, easily assembled components: a closing body, a holder with throughflow portions, and a valve seat. This modular segmentation allows for simple installation and maintenance while ensuring reliable backflow prevention through the coordinated function of each component.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The closing body serves dual functions: it prevents backflow by sealing against the valve seat while simultaneously providing its own actuation mechanism through its weight and magnetic interaction. The valve operates autonomously without requiring external spring components to return the closing body to its sealing position.

Inventive Principle:

Principle #25Self-service

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 achieves a simple and reliable operation with minimal components, reducing manufacturing complexity and costs, while effectively preventing backflow and maintaining the integrity of motor electronics.

Implementation Method 1

A check valve is often used to prevent a return flow of the conveyed medium or oil in such a hydraulic system

Methodology Applied

Scientific EffectGravity: Gravitation

Implementation Method 2

the pressure difference between inflow and outflow side of the oil pump and thus the drop in pressure

Methodology Applied

Scientific EffectPressure difference: Pressure Gradient

Data Source

PatentUS12305639B2Electromotive oil pump comprising a non-return valve

Publication Date: 2025.05.20 BROSE FAHRZEUGTEILE GMBH & CO KG

AI summary

An electrical oil pump comprising a pump housing containing an electromotively driven pump rotor, and a discharge branch arranged on the housing side and receiving a non-return valve, said valve comprising a preferably spherical closing body arranged such that it can move between a valve seat and a supporting surface, and a closing body holder which is inserted into the discharge branch, forms the supporting surface and comprises through-flow sections, said holder being inserted into the discharge branch for captive holding therein.