Modular Ratchet Cap Torque Control and Component Replacement
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Solution Overview
Problem
Existing cap assemblies for fuel tanks lack modularity, making it difficult to replace worn or damaged components without replacing the entire assembly, and they do not provide adequate torque control to prevent over-tightening, which can damage the threaded opening.
Innovation Solution
A modular cap assembly with a ratchet mechanism that limits torque during tightening, allowing for easy replacement of components such as the ratchet assembly, tether, and vent modules, and includes a vented design to accommodate different configurations and regulatory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing cap assemblies are designed as integrated units, then manufacturing and initial assembly are simplified, but component replacement becomes difficult and costly
Solution Approach 1:
The cap assembly is divided into separate modular components including a cap body, ratchet mechanism, tether assembly, and vent module. Each component can be independently manufactured, assembled, and replaced. The cap body includes external threads for engagement with the fuel tank opening, while the ratchet mechanism with pawl and gear teeth provides torque control. This segmentation allows selective replacement of worn or damaged components without replacing the entire assembly, reducing maintenance costs and improving ease of repair.
2Device complexity
If no torque control mechanism is provided, then the cap assembly structure is simpler, but over-tightening can damage the threaded opening
Solution Approach 1:
The ratchet mechanism provides automatic torque control during cap installation. As the cap is threaded onto the fuel tank opening, the ratchet mechanism engages when a predetermined torque threshold is reached, preventing further tightening and protecting the threaded opening from damage. The pawl engages with the gear teeth to create a one-way locking action that limits maximum torque application. This self-regulating mechanism protects the threaded connection without requiring external monitoring or control systems.
3Ease of manufacture
If the cap assembly is made non-modular, then manufacturing costs are reduced, but adaptability to different configurations and regulations decreases
Solution Approach 1:
The cap assembly incorporates multiple functional modules that can be configured to meet different regulatory requirements and application needs. The vent module can be supplied in different configurations (vented or non-vented), the tether assembly can have varying lengths and attachment configurations, and the cap body can accommodate different thread sizes and types. This modular universality allows a single base design to serve multiple purposes and comply with different environmental regulations without requiring completely different assembly designs.
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 modular design enables easy replacement of components, prevents over-tightening damage, and meets regulatory standards by allowing for customizable configurations and venting, enhancing the functionality and durability of the cap assembly.
Implementation Method 1
a ratchet assembly (24) positioned within the cap body (30) and including a pawl (60) and gear teeth (64)
Implementation Method 2
A modular cap assembly with a ratchet mechanism that limits torque during tightening
Data Source
AI summary
A method of assembling selected modular ratchet cap assemblies. In one aspect, the method includes the acts of providing identical threaded portions, providing identical cover portions, providing a first vent module, providing a second vent module different from the first vent module, selecting the first vent module and coupling together the first vent module with one of the identical threaded portions and one of the identical cover portions to form a first cap assembly, and selecting the second vent module and coupling together the second vent module with another one of the identical threaded portions and another one of the identical cover portions to form a second cap assembly. In other aspects, the method includes assembling first and second cap assemblies with identical cover portions and threaded portions, but having different pawl members providing different cap-installing torque limits. In other aspects, the method includes providing first and second cap assemblies with similar components, but having covers or portions thereof provided with different individualized characteristics for different applications.