Linerless Hydraulic Piston Bore Coating for Weight Reduction
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Solution Overview
Problem
Hydraulic crimpers and cutters are hindered by the weight, size, and cost associated with the piston sleeve, necessitating a more affordable, smaller, and lighter weight solution.
Innovation Solution
A linerless hydraulic piston bore is implemented, featuring a hydraulic pump with a piston coated on its interior surface, using materials like nickel matrix silicon carbide to reduce weight and increase lubricity, eliminating the need for a separate piston sleeve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston sleeve is used in the hydraulic piston bore, then the tool provides reliable hydraulic function, but the tool weight, size, and cost increase
Solution Approach 1:
The patent removes the piston sleeve component entirely from the hydraulic system. Instead of using a separate sleeve, the piston bore itself is directly coated with a low-friction material (such as nickel matrix silicon carbide or PTFE) that provides the necessary lubricity and wear resistance. This extraction of the intermediate component reduces weight, size, and cost while maintaining hydraulic reliability through the coated surface.
Solution Approach 2:
The patent combines the functions of the piston bore and the lubricating surface into a single integrated structure. The coating is applied directly to the piston bore, merging what were previously separate components (bore + sleeve) into one unified element. This integration eliminates the need for additional parts while preserving the hydraulic sealing and lubrication functions.
2Reliability
If a piston sleeve is used in the hydraulic piston bore, then the tool provides reliable hydraulic function, but the tool size and cost increase
Solution Approach 1:
The patent removes the piston sleeve component entirely from the hydraulic system. Instead of using a separate sleeve, the piston bore itself is directly coated with a low-friction material (such as nickel matrix silicon carbide or PTFE) that provides the necessary lubricity and wear resistance. This extraction of the intermediate component reduces weight, size, and cost while maintaining hydraulic reliability through the coated surface.
Solution Approach 2:
The patent combines the functions of the piston bore and the lubricating surface into a single integrated structure. The coating is applied directly to the piston bore, merging what were previously separate components (bore + sleeve) into one unified element. This integration eliminates the need for additional parts while preserving the hydraulic sealing and lubrication functions.
3Reliability
If a piston sleeve is used in the hydraulic piston bore, then the tool provides reliable hydraulic function, but the tool cost increases
Solution Approach 1:
The patent removes the piston sleeve component entirely from the hydraulic system. Instead of using a separate sleeve, the piston bore itself is directly coated with a low-friction material (such as nickel matrix silicon carbide or PTFE) that provides the necessary lubricity and wear resistance. This extraction of the intermediate component reduces weight, size, and cost while maintaining hydraulic reliability through the coated surface.
Solution Approach 2:
The patent combines the functions of the piston bore and the lubricating surface into a single integrated structure. The coating is applied directly to the piston bore, merging what were previously separate components (bore + sleeve) into one unified element. This integration eliminates the need for additional parts while preserving the hydraulic sealing and lubrication functions.
4Reliability
If the piston bore interior surface is coated with low-friction material, then wear resistance and lubricity improve, but manufacturing complexity increases
Solution Approach 1:
The patent changes the surface properties of the piston bore by applying a coating with different friction and wear characteristics. The coating process transforms the interior surface from a standard machined surface to a low-friction surface, improving lubricity and wear resistance. The honing step adjusts the surface geometry parameters to ensure proper piston fit and hydrodynamic lubrication.
Solution Approach 2:
The patent uses composite material structures, specifically mentioning nickel matrix silicon carbide and PTFE coatings. These composite materials combine the structural properties of metal matrices with the low-friction properties of ceramic or polymer additives, creating a surface that provides both mechanical strength and reduced friction.
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
The solution results in a lighter, more compact tool with extended service life and reduced wear, while maintaining performance, by using a nickel matrix silicon carbide coating that enhances lubricity and wear resistance.
Implementation Method 1
using materials like nickel matrix silicon carbide to reduce weight and increase lubricity
Data Source
AI summary
A hydraulic tool, such as a hydraulic crimper/cutter is provided. The tool includes a hydraulic pump defining a hydraulic piston bore and a hydraulic piston arranged within the hydraulic piston bore. The hydraulic piston bore includes a nickel matrix silicon carbide (e.g., Nikasil®) coating to increase wear resistance and lubricity of the piston bore, without increasing the size or weight of the tool.