Piston Pump Element Machining for Flow Resistance Reduction
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Solution Overview
Problem
Existing piston pump production methods are inefficient and costly, particularly in creating a pressure-resistant piston pump with optimized suction regions and reduced flow resistance.
Innovation Solution
The method involves producing the second piston element with a press fit and longitudinal bore in a single step, incorporating an annular channel and transverse bores to reduce flow resistance, and using a stepped tool for precise and inexpensive machining, allowing for series manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple machining operations are performed separately on the second piston element, then manufacturing precision can be maintained, but productivity decreases and manufacturing cost increases
Solution Approach 1:
The patent combines multiple machining operations (producing the press fit, longitudinal bore, annular channel, and stop edge) into a single working step using a specially designed machining tool. This merging of operations increases productivity while maintaining manufacturing precision through the tool's specialized geometry that ensures accurate feature formation in one pass.
Solution Approach 2:
The machining tool is designed with multiple functional elements that can perform different machining tasks simultaneously. The tool includes cutting edges configured to create the press fit, longitudinal bore, annular channel, and stop edge in a single operation, making it a multi-functional tool that improves生产效率 without sacrificing precision.
2Manufacturing precision
If multiple separate machining steps are used to create the press fit and longitudinal bore, then manufacturing precision is maintained, but manufacturing cost increases
Solution Approach 1:
The patent merges the creation of the press fit and longitudinal bore into a single machining operation. The machining tool is specifically designed with cutting edges that can form both features simultaneously, reducing the number of setup changes and tool exchanges required, thereby lowering manufacturing costs while maintaining feature accuracy.
Solution Approach 2:
The machining tool is pre-configured with the specific geometry and cutting edge arrangements needed to create both the press fit and longitudinal bore in one operation. This preliminary preparation of the tool allows for efficient single-step machining, reducing overall manufacturing complexity and cost while ensuring accurate feature formation.
3Ease of manufacture
If conventional machining processes are used for the second piston element, then manufacturing simplicity is maintained, but flow resistance in the piston pump increases
Solution Approach 1:
The patent combines the creation of the annular channel and longitudinal bore in a single machining operation using a specially designed tool. This approach maintains manufacturing simplicity by avoiding multiple complex setup changes while creating optimized flow paths that reduce turbulence and flow resistance in the piston pump.
Solution Approach 2:
The machining process creates specific local geometries (annular channel, longitudinal bore with optimized dimensions and positioning) that improve fluid flow characteristics in critical areas of the piston element. The tool is designed to produce these locally optimized features with precise dimensions and surface quality, reducing flow resistance without complicating the overall manufacturing process.
Data Source
AI summary
A method is used to produce a piston pump having a housing and a piston subassembly. The piston subassembly is displaceably guided in the housing and has a first, rod-like piston element and a second, sleeve-like piston element. The second piston element is connected to the first piston element via a press fit. At least one transverse bore and a longitudinal bore are arranged in the second piston element. A stop edge for the housing is arranged on the second piston element. The piston subassembly also has an inlet valve, which includes a receiving element, in which an inlet valve spring and an inlet valve sealing element are arranged. The piston subassembly also has a corresponding inlet valve seat, which is arranged on the second piston element. While the second piston element is being machined, the press fit and the longitudinal bore are produced and/or finished in one step.