Working Cylinder Threaded Coupling for Corrosion Protection
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Solution Overview
Problem
Existing working cylinders face issues with corrosion due to fastening threads that are machined on piston rods, leading to corrosion protection loss and material weakening, and require frequent grease application, which is environmentally harmful and labor-intensive.
Innovation Solution
A working cylinder design featuring corrosion-resistant threaded coupling modules on the rod and base sides, welded to the piston unit and closure parts, using laser welding to ensure uninterrupted protection without additional coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fastening threads are machined on piston rods, then coupling capability is achieved, but corrosion protection is destroyed and material is weakened
Solution Approach 1:
The coupling function is separated from the piston rod by introducing a separate threaded coupling module. The piston rod ends remain smooth and corrosion-protected, while the threaded coupling module (with external threads) attaches via laser welding to provide the coupling capability without compromising the piston rod's corrosion protection.
Solution Approach 2:
The threaded coupling module acts as an intermediary component between the piston rod and the device to be actuated. It combines the smooth, corrosion-protected piston rod end with the threaded coupling function through laser welding, eliminating the need to machine threads directly on the piston rod.
2Adaptability or versatility
If fastening threads are machined on piston rods, then coupling capability is achieved, but cross-section is weakened
Solution Approach 1:
The coupling function is separated from the piston rod by introducing a separate threaded coupling module. The piston rod ends remain smooth and corrosion-protected, while the threaded coupling module (with external threads) attaches via laser welding to provide the coupling capability without compromising the piston rod's corrosion protection.
Solution Approach 2:
The threaded coupling module acts as an intermediary component between the piston rod and the device to be actuated. It combines the smooth, corrosion-protected piston rod end with the threaded coupling function through laser welding, eliminating the need to machine threads directly on the piston rod.
3Reliability
If thick layer of grease is applied to protect fastening threads, then corrosion protection is improved, but environmental impact increases and manual labour input increases
Solution Approach 1:
The threaded coupling module is designed with inherent corrosion protection through its material composition (stainless steel, galvanized steel, or aluminum with anodizing) and structural design (sealed thread regions). The sealing elements (O-rings, grease seals, or plastic inserts) automatically protect the thread regions without requiring external grease application or maintenance.
Solution Approach 2:
The invention changes the corrosion protection approach from external chemical protection (grease) to inherent material protection (stainless steel, galvanized steel, anodized aluminum) combined with mechanical sealing (O-rings, grease seals). This parameter change eliminates the need for frequent grease application and reduces environmental impact.
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
Provides reliable corrosion protection, reduces material consumption, and simplifies production with cost-effective laser welding, eliminating the need for machining and frequent grease application.
Implementation Method 1
using laser welding to ensure uninterrupted protection without additional coatings
Data Source
AI summary
A working cylinder has a cylinder with a cylinder tube, a first closure part arranged on a first cylinder tube end and a second closure part arranged on a second cylinder tube end, The cylinder tube and the closure parts define a cylinder interior. A piston unit defines at least one working space in the cylinder interior and passes through the first closure part and has an outer end portion. The working cylinder has a corrosion resistant rod-side threaded coupling module with a threaded portion and a weld-on portion. The threaded portion is for coupling to a device to be actuated. The coupling module is welded by the weld-on portion to the outer end portion of the piston unit by a weld seam. The threaded portion is arranged on a longitudinal axis of the piston unit.