Concentric Piston Variable Displacement Hydraulic Device
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Solution Overview
Problem
Current axial piston pump designs face mechanical complications, operational inefficiencies, and vibration/noise issues due to dynamic torque changes, leading to high maintenance costs and inefficient fluid flow management.
Innovation Solution
A variable displacement hydraulic device with concentrically positioned pistons and a locking mechanism that allows for independent control of piston motion, enabling separate fluid output through multiple outlets, reducing the need for varying stroke lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable angle rotating drive plates (wobble plate) are used to dynamically change fluid flow, then the hydraulic device can respond to changing torque conditions, but mechanical complications and maintenance costs increase
Solution Approach 1:
The invention divides the piston system into multiple independent piston groups (first piston group and second piston group), each with separate cylinders and fluid passages. This segmentation allows independent control of each piston group's displacement, eliminating the need for complex variable angle drive plates while achieving dynamic flow control through selective engagement of individual piston groups.
Solution Approach 2:
The invention implements dynamic displacement control by allowing the actuator to selectively engage or disengage from different piston groups based on operating conditions. The locking mechanism enables dynamic switching between fixed and variable displacement modes for each piston group, providing adaptability without mechanical complications of traditional wobble plate designs.
2Adaptability or versatility
If variable angle rotating drive plates are used to dynamically change fluid flow, then the hydraulic device can respond to changing torque conditions, but operational efficiency decreases
Solution Approach 1:
The actuator can dynamically adjust the displacement of each piston group independently by engaging or disengaging from specific pistons. This dynamic control allows the hydraulic device to optimize fluid flow and maintain high operational efficiency across varying torque conditions, eliminating the efficiency losses associated with traditional variable angle drive plate mechanisms.
3Productivity
If traditional axial piston pump design is used, then fluid flow can be generated, but vibration and noise increase
Solution Approach 1:
By segmenting the piston system into multiple independent groups with separate cylinders and fluid passages, the invention isolates the reciprocating motions of different piston groups. This segmentation reduces the cumulative vibration and noise that would occur in traditional designs where all pistons operate simultaneously in a single cylinder bank, while maintaining high fluid flow output.
4Productivity
If locking mechanism is engaged to inhibit first piston motion, then unnecessary piston motion is reduced, but device complexity increases
Solution Approach 1:
The locking mechanism provides dynamic control over piston group engagement, allowing the system to switch between different operational modes as needed. This controlled complexity enables efficient fluid flow management by selectively inhibiting piston motion only when necessary, while maintaining the simplicity of fixed displacement designs when variable displacement is not required.
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 provides efficient fluid flow management by inhibiting unnecessary piston motion, reducing noise and vibration, and lowering maintenance costs through variable displacement operation.
Implementation Method 1
a locking mechanism for inhibiting the first reciprocal motion of the first piston; wherein when engaged the locking mechanism inhibits the first portion of said outputting of the hydraulic fluid by decoupling the first piston from the actuator
Data Source
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AI summary
A variable displacement hydraulic device comprising: a housing having an inlet for receiving hydraulic fluid and an outlet for outputting the hydraulic fluid, the housing having a reciprocation axis; a first cylinder positioned in the housing along the reciprocation axis, the first cylinder having a first input for receiving the hydraulic fluid on a first intake stroke and a first output for ejecting the hydraulic fluid on a first exhaust stroke; a first piston positioned for a first reciprocal motion within the first cylinder, the first piston having a first main end exposed to the hydraulic fluid and a second main end coupled to an actuator, the actuator for driving the second main end when coupled to the actuator for causing the first reciprocal motion to induce a first portion of said outputting of the hydraulic fluid; a second cylinder positioned in the first piston along the reciprocation axis, the second cylinder having a second input for receiving the hydraulic fluid on a second intake stroke and a second output for ejecting the hydraulic fluid on a second exhaust stroke; a second piston positioned for a second reciprocal motion within the second cylinder, the second piston having a first secondary end exposed to the hydraulic fluid and a second secondary end coupled to the actuator, the actuator for driving the second secondary end when coupled to the actuator for causing the second reciprocal motion to induce a second portion of said outputting of the hydraulic fluid; and a locking mechanism for inhibiting the first reciprocal motion of the first piston; wherein when engaged the locking mechanism inhibits the first portion of said outputting of the hydraulic fluid by decoupling the first piston from the actuator while continued operation of the actuator provides the second portion of said outputting of the hydraulic fluid by the second piston.