Mobile Crane Vehicle Frame With Positive-Fit Detachable Connections
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Solution Overview
Problem
Existing mobile crane vehicle frames face challenges in achieving improved load-bearing capacity during operation while adhering to legal axle load limits by disassembling components for transport.
Innovation Solution
A vehicle frame design with detachable frame parts connected via a common interface featuring multiple bolting elements and engaging elements that provide a positive-fit engagement, distributing forces and moments efficiently across the interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frame parts are detachably connected via multiple bolt connections only, then the vehicle frame can be disassembled for road transport, but the load-bearing capacity during operation is insufficient
Solution Approach 1:
The patent combines multiple connection methods (bolt connections and positive-fit engagement) into a unified interface system. The engaging elements with protrusions and notches work together with bolting elements to create a composite connection that provides both disassembly capability and high load-bearing capacity, resolving the contradiction between adaptability and strength.
Solution Approach 2:
The interface combines different connection mechanisms (mechanical bolting and geometric positive-fit engagement) into a composite connection system. This composite approach leverages the advantages of both connection types to achieve both detachability and high strength, overcoming the limitation of using single connection method.
2Strength
If bolt connections are designed to absorb large forces and moments, then the load-bearing capacity is improved, but the complexity and dimensioning of the connection increases
Solution Approach 1:
The connection interface is segmented into distinct functional elements: bolting elements for clamping force and engaging elements with protrusions/notches for geometric constraint. This segmentation allows each element to be optimized for its specific function, reducing overall complexity while maintaining high force transmission capability.
Solution Approach 2:
The engaging elements with protrusions and notches act as intermediaries that transfer forces and moments between frame parts. This intermediary mechanism distributes loads across multiple contact points, reducing the complexity of individual bolt connections while maintaining overall connection strength.
3Weight of moving object
If frame parts are transported separately to reduce vehicle weight, then compliance with axle load limits is achieved, but the assembly and disassembly process becomes more time-consuming
Solution Approach 1:
The interface geometry (protrusions and notches) is designed in advance to guide the alignment and engagement of frame parts. This preliminary design of the engagement geometry enables quick and intuitive assembly without requiring complex alignment procedures, reducing assembly time while maintaining weight reduction benefits.
Solution Approach 2:
The positive-fit engagement mechanism is designed to be self-aligning and self-locking. The protrusions and notches automatically guide the frame parts into correct positioning during assembly, eliminating the need for complex alignment tools or procedures, thereby reducing assembly time and operational complexity.
Data Source
AI summary
A vehicle frame and a mobile crane having such a vehicle frame includes a first frame part and a second frame part which can be detachably connected to each other via a common interface. The interface includes multiple points at which it is bolted to bolting elements assigned to the respective frame parts. The interface also includes at least one profile along which it engages with engaging elements assigned to the respective frame parts which, when the bolting elements are aligned with each other, are in a mutually positive-fit engagement across their extent.