Hydraulic Pump End Cover Orifice Integration
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Solution Overview
Problem
Existing axial piston pumps face issues with accidental replacement of orifice-equipped valves with non-orifice valves and the high cost of special orifice valves, which can prevent vehicle motion due to fluid flow restrictions when the swash plate is slightly angled.
Innovation Solution
The design includes an end cover with system ports and a charge pump pressure cavity connected by passageways featuring orifices, allowing fluid flow between system ports and the charge pump pressure cavity, and optional orifice plugs for adjustable flow, enabling vehicle motion without the need for expensive orifice valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If orifice-equipped valves are used to control fluid flow, then vehicle motion is enabled when the swash plate is slightly angled, but the valves may be accidentally replaced by valves without orifices and they are expensive
Solution Approach 1:
The orifice is extracted from the valve and relocated to the end cover body, where it becomes a permanent structural feature rather than a component dependent on the valve. This eliminates the risk of accidental valve replacement and reduces cost by using a standard valve without requiring a special orifice valve.
Solution Approach 2:
The orifice functionality is merged into the end cover body structure itself, combining the flow control function with the housing component. This integration ensures the orifice cannot be accidentally removed or replaced, and eliminates the need for specialized expensive valves.
2Ease of operation
If orifices are placed in valves to restrict fluid flow, then vehicle motion is controlled, but the orifices may be accidentally removed or replaced
Solution Approach 1:
The orifice is merged into the end cover body as an integral structural feature rather than being a separate component in the valve. This ensures the orifice cannot be accidentally removed or replaced, maintaining reliable fluid flow control for vehicle motion.
Solution Approach 2:
The orifice is pre-formed as part of the end cover body structure during manufacturing, establishing the fluid flow path before assembly. This preliminary integration ensures the orifice remains in place and functional throughout operation.
3Ease of operation
If special orifice valves are used, then fluid flow is controlled to enable vehicle motion, but they are expensive
Solution Approach 1:
The orifice function is taken out from the expensive special valve and placed in the standard end cover body. This allows use of conventional, lower-cost valves while maintaining the fluid flow control necessary for vehicle motion.
Solution Approach 2:
The orifice functionality is copied into the end cover body structure itself, creating a permanent flow restriction feature that replaces the need for expensive specialized valves. The end cover body becomes the carrier of the flow control function.
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 ensures vehicle motion by allowing fluid flow between system ports and the charge pump pressure cavity, even when the swash plate is slightly angled, and allows for cost-effective and interchangeable orifice plugs, addressing the issues of accidental valve replacements and high costs.
Implementation Method 1
Fluid flows through the orifice so as to soften a transition of the vehicle from a stationary position to a forward or reverse motion
Data Source
AI summary
A pump having an endplate with an orifice provided between the system ports and the charge pump pressure cavity. Fluid flows through the orifice so as to soften a transition of the vehicle from a stationary position to a forward or reverse motion when a swash plate of the pump is angled slightly relative to a neutral or zero position.