Fluid Pressure Cylinder Head Cover Staking for Seal and Fixation
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Solution Overview
Problem
Conventional fluid pressure devices require multiple parts and complex configurations for sealing and fixing, increasing production costs and assembly time.
Innovation Solution
A fluid pressure device design that eliminates the need for locking and sealing means by using deformed portions formed through plastic deformation of the cylinder tube ends to securely attach and seal the covering member, reducing the number of parts and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking rings and sealing members are provided to fix and seal the covering member, then the sealing performance and fixation reliability are improved, but the number of parts and device complexity increase
Solution Approach 1:
The invention merges the fixation function and sealing function into a single integrated structure. The covering member itself is designed with both the fixation mechanism (deformed portion) and the sealing mechanism (sealing rib) as inherent features, eliminating the need for separate locking rings and sealing members. This consolidation reduces the number of parts while maintaining both fixation reliability and sealing performance.
Solution Approach 2:
The covering member serves multiple functions simultaneously: it seals the piston chamber, fixes itself to the cylinder tube, and provides the sealing interface. The deformed portion of the covering member actively engages with the cylinder tube to provide both mechanical fixation and sealing, making the covering member self-sufficient without requiring additional components.
2Reliability
If locking rings and sealing members are provided to fix and seal the covering member, then the fixation reliability is improved, but the assembly time and production costs increase
Solution Approach 1:
The fixation and sealing functions are combined into the covering member's inherent structure, eliminating the need for separate assembly steps for installing locking rings and sealing members. The covering member is installed in a single operation, significantly reducing assembly time while maintaining fixation reliability through the deformed portion design.
Solution Approach 2:
The covering member is pre-formed with the deformed portion and sealing rib features during manufacturing. These fixation and sealing features are built into the covering member before installation, so no additional operations are required during assembly to create these features, thereby reducing assembly time and production costs.
3Productivity
If a simpler configuration is used to reduce the number of parts, then the production costs and assembly time are reduced, but the sealing performance and fixation reliability may be compromised
Solution Approach 1:
The covering member incorporates localized sealing features (sealing rib) and fixation features (deformed portion) at specific locations where they are most effective. The sealing rib is positioned to contact the cylinder tube at the sealing interface, and the deformed portion is shaped to engage with the cylinder tube at the fixation location, providing reliable sealing and fixation without requiring a complex overall structure.
Solution Approach 2:
The invention changes the physical state and geometry of the covering member by forming a deformed portion through plastic deformation. This permanent deformation creates a mechanically interlocking structure that provides reliable fixation. The sealing rib geometry is also optimized to ensure effective sealing contact, maintaining sealing performance with a simpler configuration.
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 approach ensures reliable sealing and fixation while minimizing the number of parts and assembly time, thereby reducing production costs and enhancing efficiency.
Implementation Method 1
a deformed portion formed by deforming the end
Data Source
AI summary
A fluid pressure cylinder. A first stepped section having a greater diameter than a cylinder chamber is formed at one end of a cylinder tube constituting a fluid pressure cylinder. A disc-shaped head cover is inserted into the cylinder chamber. The one end is pressed and plastically deformed by a staking jig to form a deformed section, and the head cover is affixed within the first stepped section by the deformed section. As a result of this configuration, the head cover can be more firmly affixed while the sealing effect between the cylinder tube and the head cover is ensured. This eliminates need for a seal means and an engagement means which is used to affix the head cover, and consequently, the number of parts can be reduced.