Rotary Swash Plate Pump Stroke Control for Variable Discharge
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Solution Overview
Problem
Existing rotary swash plate piston pumps have a fixed discharge capacity, limiting their adaptability to varying operational needs.
Innovation Solution
A rotary swash plate hydraulic pump with a variable capacity mechanism that adjusts the effective stroke length of pistons through a mechanism comprising spools, springs, and a swash plate rotating shaft, allowing for changes in discharge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed discharge capacity pump design is used, then the structure is simple and reliable, but the pump cannot adapt to varying operational needs
Solution Approach 1:
The invention applies the dynamics principle by making the piston stroke length adjustable through a variable capacity mechanism. The mechanism allows the piston stroke to be dynamically changed while the pump operates, enabling the discharge capacity to be adapted to different operational requirements. This transforms a static fixed-capacity pump into a dynamic variable-capacity pump without requiring complete structural redesign.
Solution Approach 2:
The invention implements parameter changes by modifying the effective stroke length of the pistons through the variable capacity mechanism. By changing the stroke length parameter, the pump's discharge capacity is adjusted. This allows the same pump structure to operate at different capacities by simply changing the geometric parameter of the piston movement, rather than changing the entire pump configuration.
2Productivity
If a variable capacity mechanism is added to adjust piston stroke length, then discharge capacity can be changed, but the device complexity increases
Solution Approach 1:
The variable capacity mechanism serves multiple functions: it adjusts the piston stroke length, controls the discharge capacity, and maintains system pressure balance. By designing a mechanism that performs these multiple functions simultaneously, the invention avoids adding separate systems for each function, thereby limiting the increase in overall device complexity while achieving variable discharge capacity.
Solution Approach 2:
The invention introduces a variable capacity mechanism as an intermediary component between the fixed pump structure and the variable discharge requirement. This intermediary mechanism translates control input into stroke length adjustment, allowing the existing pump structure to achieve variable capacity without requiring complete redesign of the main pumping components.
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 pump's discharge capacity can be dynamically adjusted, enhancing its operational flexibility and efficiency by minimizing power loss and pressure fluctuations.
Implementation Method 1
a rotary swash plate rotatably housed in the casing so as to face the one end surface of the cylinder block; a plurality of pistons each of which is inserted into a corresponding one of the plurality of cylinder bores and reciprocates within the corresponding one of the plurality of cylinder bores by rotation of the rotary swash plate
Data Source
AI summary
This rotary swash plate hydraulic pump includes: a casing; a cylinder block disposed in the casing so as to prevent relative rotation of the cylinder block and including a plurality of cylinder bores that are open on one end surface of the cylinder block; a rotary swash plate rotatably housed in the casing so as to face the one end surface of the cylinder block; a plurality of pistons each of which is inserted into a corresponding one of the plurality of cylinder bores and reciprocates within the corresponding one of the plurality of cylinder bores by rotation of the rotary swash plate; and a variable capacity mechanism that changes an effective stroke length of at least one piston included in the plurality of pistons.