Hydraulic Piston Pump Barrel Compound Angled Apertures

Solution Overview

Problem

Hydraulic piston pumps face limitations in delivering fluid at high speeds and pressures required by modern earth-moving equipment, leading to inefficiencies and cavitation due to incomplete filling and exhaustion of cylinders.

Innovation Solution

The design incorporates a hydraulic piston pump barrel with cylinders having fluid flow apertures defined by surfaces at compound angles, including first and second output and input engagement walls at different angles, optimizing fluid flow paths for complete filling and expulsion, and providing structural rigidity to withstand high pressures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If conventional pump designs are used, then structural simplicity is maintained, but fluid delivery speed and pressure are limited

Engineering Contradiction:

Improvefluid delivery speedVSAvoidpump structure complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent applies local quality by creating compound angled surfaces at specific locations within the pump barrel. The first and second engagement walls are positioned at different angles (first angle and second angle) relative to the cylinder wall, optimizing fluid flow paths in specific regions while maintaining overall structural integrity. This localized geometric modification enables high-speed fluid delivery without requiring complete redesign of the entire pump structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes geometric parameters by defining engagement walls at specific angular orientations relative to the cylinder wall. The first engagement wall is at a first angle and the second engagement wall is at a second angle, creating compound angled fluid flow paths. These parameter changes optimize the flow characteristics and enable the pump to deliver fluid at higher speeds and pressures while maintaining structural rigidity.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If high speeds and pressures are delivered, then productivity increases, but cylinder filling becomes incomplete causing cavitation

Engineering Contradiction:

Improvefluid delivery rateVSAvoidpump operation stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The compound angled engagement walls are designed to preliminarily direct and optimize fluid flow paths before the piston reaches the critical filling stage. The first and second engagement walls create optimized flow channels that ensure complete cylinder filling is achieved even at high delivery speeds, preventing cavitation by ensuring adequate fluid supply to the piston cavity during the suction stroke.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies local quality by creating compound angled surfaces at specific locations within the pump barrel. The first and second engagement walls are positioned at different angles (first angle and second angle) relative to the cylinder wall, optimizing fluid flow paths in specific regions while maintaining overall structural integrity. This localized geometric modification enables high-speed fluid delivery without requiring complete redesign of the entire pump structure.

Inventive Principle:

Principle #3Local quality

3Power

If high pressures are withstood, then power output increases, but structural rigidity requirements increase

Engineering Contradiction:

Improvehydraulic power outputVSAvoidcomponent structural rigidity

Core Design Contradiction:

PowerVSStrength

Solution Approach 1:

The patent changes geometric parameters by defining engagement walls at specific angular orientations relative to the cylinder wall. The first engagement wall is at a first angle and the second engagement wall is at a second angle, creating compound angled fluid flow paths. These parameter changes optimize the flow characteristics and enable the pump to deliver fluid at higher speeds and pressures while maintaining structural rigidity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9151280B2Hydraulic piston pump with reduced restriction barrel passage

Publication Date: 2015.10.06 CATERPILLAR INC

AI summary

The present disclosure sets forth an axial piston pump barrel. The axial piston pump barrel is provided with cylinders, antechambers, and fluid flow apertures which are uniquely shaped and dimensioned so as to increase the overall flowability and expulsion rate of a piston pump. By providing curvilinear transition zones and fluid flow apertures, the cylinders can be completely filled and pressurized even at the extremely high pressures and RPMs required by modem machines. Such machines may include front-end loaders, excavators, pipe layers, graders, and the like wherein such pumps can be used to power hydraulic cylinders moving the implements, work arms and other tools associated with such machines.