Axial Piston Pump Barrel Balancing Chamber
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Solution Overview
Problem
Hydraulic pumps with inclined plates experience operational disturbances and accelerated ageing due to varying forces exerted on the barrel during rotation, which is exacerbated by a small number of pistons, leading to increased production costs when attempting to mitigate these issues.
Innovation Solution
The design incorporates a balancing chamber connected to the delivery aperture, providing a compressive force that maintains the barrel against the port plate with minimal variation, using a larger cross-section balancing chamber and strategically sized piston housings to ensure hydrostatic balancing, allowing for operation with a small number of pistons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the number of pistons is increased to reduce the variation of the force pressing the barrel against the port plate, then the force variation is reduced, but the production cost of the pump increases
Solution Approach 1:
A balancing chamber is introduced as an intermediary element between the barrel and the port plate. This chamber receives hydraulic fluid from the delivery aperture and generates a counterbalancing force that compensates for the variations in piston forces, thereby stabilizing the barrel-port plate contact force without requiring an increased number of pistons
Solution Approach 2:
The invention utilizes hydraulic pressure from the delivered fluid to create a balancing force. The balancing chamber is connected to the delivery aperture, allowing high-pressure fluid to exert a force on the balancing surface that counteracts the variations in piston forces, thus stabilizing the overall force pressing the barrel against the port plate
2Ease of manufacture
If a small number of pistons is used, then the production cost is reduced, but the force variation pressing the barrel against the port plate increases
Solution Approach 1:
The balancing chamber acts as a counterweight mechanism by generating an opposing force that balances the variations in piston forces. The hydraulic pressure acting on the balancing surface creates a counterbalancing effect that compensates for the instability caused by using fewer pistons, thereby maintaining force stability without increasing piston count
3Productivity
If the delivery pressure is high, then the pump performance is improved, but the force separating the barrel from the port plate increases
Solution Approach 1:
The balancing chamber generates a counterbalancing force that opposes the separating force caused by high delivery pressure. The hydraulic fluid pressure acting on the balancing surface creates an equal and opposite force that prevents the barrel from separating from the port plate, even under high pump performance conditions
Solution Approach 2:
The invention uses the hydraulic pressure from the delivered fluid to create a stabilizing force. By connecting the balancing chamber to the delivery aperture, the high-pressure fluid exerts a force on the balancing surface that counteracts the separating tendency, thereby maintaining barrel-port plate contact during high-performance operation
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 solution stabilizes the barrel's position relative to the port plate during rotation, reducing operational disturbances and extending the pump's lifespan while maintaining efficiency with fewer pistons, thus reducing production costs.
Implementation Method 1
the fluid in the balancing chamber exerts a compressive force on the barrel which tends to press the barrel against the port plate
Data Source
AI summary
The invention relates to a hydraulic pump wherein a barrel is in sliding connection with a shaft and is driven in rotation by the shaft. A housing is formed in the barrel, the shaft sliding in the housing while projecting from the front face of the barrel. The housing and the shaft defining between them a balancing chamber, the balancing chamber being connected to a delivery aperture in such a way that fluid in the balancing chamber exerts a compressive force on the barrel which tends to press the barrel against a port plate.