Swash Plate Piston Pump Series Control Pins
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Solution Overview
Problem
The swash plate type piston pump faces enlargement issues due to increased power consumption when an engine drives both a mini shovel's hydraulic actuator and an air conditioning compressor, necessitating multiple control pins to adjust discharge capacity according to varying load pressures.
Innovation Solution
The design incorporates a swash plate type piston pump with a main and sub piston pump configuration, utilizing first and second control pins arranged in series to adjust the tilting angle of the swash plate via tilt springs, allowing for variable discharge capacity and maintaining constant power consumption across different load pressures, while minimizing pump housing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple control pins are installed to handle multiple load pressures (hydraulic actuator and air conditioning compressor), then the pump can maintain constant power consumption across different operating conditions, but the pump housing size increases
Solution Approach 1:
The patent combines multiple control pins (first control pin for hydraulic actuator pressure and second control pin for air conditioning compressor pressure) into a single integrated control mechanism. Both control pins operate on the same swash plate within a unified pressure control system, allowing the pump to respond to multiple load pressures simultaneously without requiring separate pump housings or control systems for each function.
Solution Approach 2:
The swash plate type piston pump is designed with multi-functionality to handle both hydraulic actuator operations and air conditioning compressor operations through a single pump unit. The control pins are integrated into a universal pressure control system that can accommodate different load pressure conditions, enabling the pump to serve multiple functions without increasing overall pump size.
2Ease of manufacture
If control pins are installed inside a part removable from the casing, then the control pins can be fabricated independently of casing machining, but the pump requires additional assembly complexity and potential leakage paths
Solution Approach 1:
The control pins are integrated directly into the pump housing structure, combining the control pin fabrication with the casing machining process. This eliminates the need for separate removable parts and reduces assembly complexity, while maintaining the ability to manufacture control pins with precise dimensions through integrated machining operations.
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
This configuration effectively controls power consumption and reduces pump size by allowing the swash plate to adjust its tilting angle in response to multiple load pressures, maintaining constant engine output and reducing the overall pump size.
Implementation Method 1
first and second tilt springs for biasing the swash plate in the direction to increase the tilting angle
Implementation Method 2
first control pin for reducing the tilting angle of the swash plate according to discharge pressure of a piston pump and a pilot pressure, and a second control pin for reducing the tilting angle of the swash plate according to the discharge pressure of the sub piston pump
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A swash plate type piston pump includes a plurality of pistons, a cylinder block including a plurality of cylinders for housing the pistons, a swash plate for reciprocating the pistons to expand and contract volume chambers of the cylinders with the rotation of the cylinder block, a biasing mechanism for biasing the swash plate in a direction to increase a tilting angle, a first control pin for driving the swash plate in a direction to reduce the tilting angle according to a first load pressure, and a second control pin for driving the swash plate in a direction to reduce the tilting angle according to a second load pressure. The first and second control pins are connected in series.