Hydraulic Variable Pump Set with Integrated Control Valve

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Solution Overview

Problem

Existing hydraulic pump control systems for excavators are complex, costly, and occupy large space due to external feedback control mechanisms, making them difficult to maintain and inefficient in displacement control.

Innovation Solution

A hydraulic variable pump set integrating a pump body component with a first slide valve and control valve, an oil supplement component, and electronically-controlled pressure relief, failure-safety, and pressure cutoff components, allowing for internal control of displacement and reduced complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If external feedback control mechanisms are used to control variable pump displacement, then control functions can be achieved, but the control system becomes complicated in structure and high in cost

Engineering Contradiction:

Improvecontrol functionVSAvoidcontrol system structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent integrates the control valve directly into the variable pump body, merging the pump and control valve into a single integrated unit. This eliminates the need for separate external control systems while maintaining the displacement control function, thereby reducing structural complexity and cost.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated control valve within the pump body serves multiple functions: it controls the displacement of the variable pump while also managing hydraulic fluid flow. This multi-functionality reduces the need for additional separate control components, simplifying the overall system structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If external feedback control mechanisms are used to control variable pump displacement, then control functions can be achieved, but the system becomes large in volume and takes up a large space

Engineering Contradiction:

Improvecontrol functionVSAvoidsystem volume

Core Design Contradiction:

Adaptability or versatilityVSVolume of stationary object

Solution Approach 1:

By merging the control valve with the pump body into a single integrated component, the system volume is significantly reduced. The control valve no longer requires separate housing and mounting space, as it is incorporated directly into the pump's internal structure.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If external feedback control mechanisms are used to control variable pump displacement, then control functions can be achieved, but the follow-up maintenance becomes complicated

Engineering Contradiction:

Improvecontrol functionVSAvoidmaintenance complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of repair

Solution Approach 1:

The integration of the control valve into the pump body creates a single maintenance unit. Instead of maintaining separate external control systems and pumps independently, technicians can service the integrated unit as one component, simplifying maintenance procedures and reducing complexity.

Inventive Principle:

Principle #5Merging (Combining)

4Adaptability or versatility

If external feedback control mechanisms are used to control variable pump displacement, then control functions can be achieved, but the structure becomes complicated in structure

Engineering Contradiction:

Improvecontrol functionVSAvoidstructure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the control valve structure with the pump body structure, eliminating the need for separate external control mechanisms. This integration significantly simplifies the overall system structure while preserving the displacement control function through internal hydraulic pathways.

Inventive Principle:

Principle #5Merging (Combining)

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 solution simplifies the structure, reduces volume, and enables efficient displacement control of the variable pump, enhancing maintenance ease and reducing costs while ensuring reliable operation of the excavator.

Implementation Method 1

The variable pump is in communication with the oil inlet A of the first control valve, the oil outlet T of the first control valve is in communication with the rod cavity

Methodology Applied

Scientific EffectHydraulic control: Hydraulic Press

Implementation Method 2

the rodless cavity is in communication with the oil outlet T of the first control valve through the first slide valve

Methodology Applied

Scientific EffectHydraulic pressure balance: Pascal's Law

Implementation Method 3

the variable cylinder is mechanically connected to the spring end and the swash plate

Methodology Applied

Scientific EffectMechanical connection: Mechanical Advantage

Data Source

PatentUS11280357B1Hydraulic variable pump set and excavator

Publication Date: 2022.03.22 LINDE HYDRAULICS (CHINA) CO LTD

AI summary

Provided is a hydraulic variable pump set, including a pump body component and an oil supplement component. The pump body component includes a pump body, a first slide valve, and a first control valve. The first slide valve includes a spring end and a pilot cavity. The first control valve is provided with an oil inlet A, an oil inlet B, and an oil outlet T. The pump body includes a variable pump and a variable cylinder. The variable pump includes a swash plate. The variable cylinder includes a rod cavity and a rodless cavity. The variable cylinder is mechanically connected to the spring end and the swash plate. The oil supplement component is in communication with the pilot cavity.