Variable Displacement Pump Actuator Piston Segmentation
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Solution Overview
Problem
Current variable displacement pumps rely on a single seal actuator piston, which limits their response rate and efficiency due to the size of the actuator piston and return springs.
Innovation Solution
A variable displacement pump system featuring a piston sleeve with multiple inner diameter portions and an actuator piston with corresponding outer diameter portions, allowing for multiple pressure volumes and ports for improved control and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single seal actuator piston is used in variable displacement pumps, then the structure is simple, but the response rate is limited due to the size of the actuator piston and return springs
Solution Approach 1:
The actuator piston is divided into multiple segments (first actuator piston portion, second actuator piston portion, third actuator piston portion) with different outer diameters, each sealing against corresponding inner diameter portions of the piston sleeve. This segmentation allows each segment to respond to pressure changes independently, significantly improving the overall response rate while maintaining structural manageability through modular design.
Solution Approach 2:
The invention transitions from a single-dimensional actuator piston to a multi-dimensional structure with varying outer diameters along the axial direction. The first, second, and third actuator piston portions have progressively different outer diameters that correspond to different inner diameter portions of the piston sleeve, creating a stepped configuration that enables multi-level pressure control and faster response.
2Speed
If the actuator piston size is reduced to improve response rate, then the response rate increases, but the force generation capability decreases
Solution Approach 1:
The actuator piston is segmented into multiple portions with different outer diameters (first outer diameter, second outer diameter, third outer diameter), where each segment can be optimized for its specific function. Smaller diameter segments provide faster response to pressure changes, while larger diameter segments generate greater force, allowing the overall system to achieve both high response rate and sufficient force generation capability simultaneously.
Solution Approach 2:
Different portions of the actuator piston are given different local qualities through varying outer diameters. The first actuator piston portion has a first outer diameter optimized for one function, the second has a second outer diameter for another function, and the third has a third outer diameter for a third function. This local differentiation allows each segment to perform its specific role optimally, balancing response rate and force generation.
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 system enables precise control over the position and rate of movement of the actuator piston, enhancing the response rate and efficiency of the variable displacement pump.
Implementation Method 1
The first piston portion of the actuator piston and the first inner diameter portion of the piston sleeve define a first pressure volume
Implementation Method 2
The first piston portion and second piston portion of the actuator piston and the first inner diameter portion and the second inner diameter portion of the piston sleeve define a second pressure volume
Data Source
AI summary
A variable displacement pump system can include a piston sleeve having at least a first inner diameter portion and a second in inner diameter portion and an actuator piston configured to be disposed within the piston sleeve. The actuator piston can have a first piston portion having a first outer diameter, and a second piston portion having a second outer diameter. The first outer diameter can be different than the second outer diameter. The first piston portion can be configured to seal to the first inner diameter portion of the piston sleeve. The second piston portion of the actuator piston can be configured to seal to the second inner diameter portion of the piston sleeve.