Cylinder Block Hub Insert With Anti-Rotation for Pump Remanufacturing
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Solution Overview
Problem
Conventional fluid pumps with axial piston designs face failure at the connection interface between the cylinder block and shaft, necessitating complete replacement of the cylinder block despite other components being functional, and existing remanufacturing methods lack effective anti-rotation mechanisms for spline inserts.
Innovation Solution
A cylinder block design featuring a hub insert with anti-rotation bodies to prevent rotation relative to the cylindrical body, utilizing an interference fit and channels to secure the hub insert, allowing for the replacement of worn or damaged internal splines while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cylinder block is replaced in its entirety when the connection interface fails, then the reliability of the pump is restored, but the cost and waste increase significantly due to discarding functional components
Solution Approach 1:
The invention divides the cylinder block into separate functional components: the main cylindrical body and the hub insert containing the connection interface. This segmentation allows the hub insert to be replaced independently when it fails, while the functional cylindrical body is retained and reused, thereby restoring pump reliability without discarding working components.
Solution Approach 2:
The invention enables selective discarding of only the failed hub insert portion while recovering and reusing the main cylindrical body. This partial replacement approach eliminates waste of functional components while restoring the pump to reliable operation.
2Ease of manufacture
If threading is used to secure the spline insert, then the insert can be maintained in position, but the insert may rotate relative to the pump barrel under high torque conditions
Solution Approach 1:
The invention incorporates anti-rotation bodies and anti-rotation features into the hub insert design before the insert is installed into the cylindrical body. These features are pre-configured to prevent rotation from the outset, eliminating the need for post-installation adjustments and ensuring rotational stability under torque conditions.
Solution Approach 2:
The anti-rotation bodies act as intermediary elements between the hub insert and the cylindrical body, providing a mechanical constraint that prevents relative rotation. These intermediary features transmit torque reliably while maintaining the insert's rotational position.
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 the remanufacturing of cylinder blocks, extending their lifespan and reducing waste by reusing functional components, and providing a cost-effective alternative to full replacement, with improved durability through the use of wear-resistant materials.
Implementation Method 1
utilizing an interference fit and channels to secure the hub insert
Data Source
AI summary
A cylinder block for a fluid pump includes a cylindrical body having a hub bore and a plurality of cylinder bores arranged about the hub bore, a hub insert disposed in the hub bore, and an anti-rotation body configured to prevent rotation of the hub insert relative to the cylindrical body. The cylindrical body and the hub insert together define a channel in which the anti-rotation body is inserted.