Shaft-Distributed Roller Piston Pump Axial Force Balance
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Solution Overview
Problem
Traditional axial piston pumps face challenges with structural flow pulsation and axial inertial force at high speeds, which are not adequately addressed by existing two-dimensional piston pumps, leading to inefficiencies and noise issues.
Innovation Solution
A shaft-distributed double-acting roller piston pump design that uses rolling support instead of sliding support, featuring a guide rail assembly with a space cam curved surface and a flow distribution shaft with staggered rectangular windows, which eliminates the gap between the guide rail and roller, balances axial inertia, and synchronizes piston motion to reduce pulsation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional axial piston pump structure is used with sliding friction pairs, then the pump can operate at lower speeds with simpler structure, but the pump performance is limited by friction constraints and cannot achieve high speed operation
Solution Approach 1:
The patent replaces the traditional sliding friction pair mechanism with a roller support mechanism. The piston is supported by rollers that rotate on the cylinder bore, converting sliding friction into rolling friction. This substitution eliminates the friction constraints that limited traditional pumps, enabling high-speed operation while maintaining reliability.
2Reliability
If two-dimensional piston pump is used to eliminate sliding friction pairs, then friction constraints are avoided, but the pump still experiences structural flow pulsation and axial inertial force that limit high-speed performance
Solution Approach 1:
The patent employs asymmetric distribution of pistons around the rotation axis, with pistons positioned at different angular intervals. This asymmetric arrangement, combined with opposite-direction reciprocating motion of pistons, balances the axial inertial forces and reduces flow pulsation, enabling high-speed operation without the harmful effects that limited previous two-dimensional pump designs.
3Productivity
If high-speed operation is achieved in traditional piston pumps, then productivity increases, but flow pulsation and axial inertial force cause tilting and noise issues
Solution Approach 1:
The patent uses pistons arranged in opposite directions that reciprocate simultaneously. The axial inertial forces generated by these oppositely moving pistons counterbalance each other, eliminating the net axial inertial force that causes tilting and noise at high speeds. This counterbalancing mechanism allows the pump to achieve high productivity without the harmful effects of tilting and noise.
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 enables fast rotation, eliminates structural flow pulsation, balances axial inertial forces, and improves efficiency by using rolling support, allowing for high-speed operation without tilting or noise issues.
Implementation Method 1
using rolling support instead of sliding support
Implementation Method 2
guide rail assembly with a space cam curved surface
Data Source
AI summary
A shaft-distributed double-acting roller piston pump includes a front end cover, a pump casing, a rear end cover and a pump core assembly. The pump core assembly includes a guide rail assembly including left and right guide rails arranged back to back. The side surfaces of the left and right guide rails away from each other are space cam curved surfaces. A flow distribution shaft is installed in the center of the guide rail assembly. A cylinder assembly is installed on both sides of the guide rail assembly including left and right cylinders, between which a piston assembly is arranged. The piston assembly forms left and right closed cavities with the left and right cylinders respectively. The piston assembly performs axial reciprocating linear motion under the constraint of the cylinder assembly and the guide rail assembly, and the volumes of the left and right closed cavities change continuously.