Swash-plate Piston Pump Pressure Release
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Solution Overview
Problem
In swash-plate type piston pumps, the pressure in the pressure chamber does not decrease quickly when the load pressure supply is stopped, preventing easy return of the swash plate to a larger tilting angle and compromising controllability.
Innovation Solution
Incorporating a discharge channel that communicates with the pressure chamber to rapidly release pressure, allowing the swash plate to return to a larger tilting angle by discharging the remaining pressure through a sliding gap between control pins and pin cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the control pin drives the swash plate in the direction where the tilting angle is made smaller in accordance with a rise in load pressure, then the driving load of the piston pump is reduced and engine power consumption is kept constant, but the pressure in the pressure chamber does not decrease quickly when load pressure supply is stopped, preventing easy return of the swash plate to a larger tilting angle
Solution Approach 1:
The pressure chamber is divided into a first pressure chamber and a second pressure chamber. The first pressure chamber receives load pressure through the control pin to control the swash plate tilting angle, while the second pressure chamber is connected to a discharge channel that rapidly discharges pressure when needed. This segmentation allows independent control of pressure retention and pressure release functions.
Solution Approach 2:
A discharge channel is introduced as an intermediary component to rapidly discharge pressure from the second pressure chamber to the discharge port. This intermediary provides a dedicated pressure release path that bypasses the normal load pressure supply route, enabling quick swash plate return to a larger tilting angle when the air conditioning device is stopped.
2Stability of the object's composition
If the pressure in the pressure chamber is maintained for a longer period after load pressure supply is stopped, then the swash plate remains in the controlled position, but the swash plate is not returned easily to a direction where the tilting angle is made larger due to remaining pressure influence
Solution Approach 1:
The pressure chamber is segmented into two independent chambers: the first pressure chamber that maintains pressure for position stability, and the second pressure chamber that can be rapidly depressurized through the discharge channel to enable easy swash plate return. This segmentation resolves the contradiction by providing separate pressure control zones.
Solution Approach 2:
The excess remaining pressure that hinders swash plate return is extracted from the system through the discharge channel connected to the second pressure chamber. By selectively removing pressure from the second chamber while maintaining it in the first chamber, the system achieves both position stability and easy return capability.
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
Enables quick pressure reduction in the pressure chamber when load pressure supply is stopped, improving controllability and ensuring efficient operation by allowing the swash plate to return to its optimal position.
Implementation Method 1
a biasing mechanism configured to bias the swash plate in a direction where a tilting angle is made larger
Implementation Method 2
a discharge channel configured to discharge the load pressure of the pressure chamber
Data Source
AI summary
A swash-plate type piston pump includes a cylinder block configured to be rotated with rotation of a driving shaft, a plurality of pistons accommodated in a plurality of cylinders provided in the cylinder block, a swash plate configured to reciprocate the piston so that a volume chamber of the cylinder is expanded/contracted with the rotation of the cylinder block, an biasing mechanism configured to bias the swash plate in a direction where a tilting angle is made larger, a control pin configured to drive the swash plate in a direction where the tilting angle is made smaller in accordance with a rise in a load pressure of a pressure chamber, and a discharge channel configured to discharge the load pressure of the pressure chamber.