Auxiliary Frame Torsional Rigidity via Box Section Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing auxiliary frames for mounting cranes on vehicles are labor-intensive and time-consuming to design and manufacture, requiring individual customization for each vehicle type, and often necessitate additional transverse elements and welding, which complicates the mounting process and increases the risk of rust.
Innovation Solution
An auxiliary frame comprising a central box section with dedicated holes for transverse members, side sections, and universal coupling plates, allowing for bolted mounting on vehicles with two spaced girders, which enhances torsional rigidity, reduces the need for additional transverse elements, and simplifies installation by eliminating welding, thus reducing the complexity and time required for mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If auxiliary frames are individually designed and manufactured for each vehicle type, then the chassis can be sufficiently reinforced to absorb the crane load, but the design and manufacturing process becomes very time-consuming and labour-intensive
Solution Approach 1:
The patent applies universality by designing a standardized auxiliary frame that can be used across multiple vehicle types. The frame incorporates adjustable transverse members with holes at different positions, allowing the same frame design to accommodate various vehicle chassis configurations while maintaining sufficient reinforcement strength.
Solution Approach 2:
The auxiliary frame is segmented into modular components including longitudinal beams, transverse members, and coupling plates. This segmentation allows for standardized manufacturing of individual components that can be assembled in different configurations to suit different vehicle types, reducing overall design and manufacturing time.
2Strength
If additional transverse elements are added to reinforce the auxiliary frame, then the structural strength is improved, but the device complexity and mounting process are increased
Solution Approach 1:
The patent merges the functions of reinforcement and mounting by integrating transverse members that serve both structural reinforcement purposes and mounting purposes for the crane. The transverse members are positioned to provide structural support while their holes align with longitudinal beams to facilitate crane mounting, eliminating the need for separate reinforcement elements.
3Strength
If welding is used to assemble the auxiliary frame components, then the structural integrity is improved, but the risk of rust and the complexity of the mounting process are increased
Solution Approach 1:
The patent replaces welding with mechanical fastening systems including bolts, nuts, and rivets to assemble auxiliary frame components. This substitution eliminates the heat-affected zones and potential rust issues associated with welding while maintaining structural integrity through properly designed mechanical connections with adequate fastening strength.
4Stability of the object's composition
If taller auxiliary frames are used to increase rigidity, then the torsional rigidity is improved, but the vehicle's center of gravity is raised and loading/unloading becomes more difficult
Solution Approach 1:
The patent enhances torsional rigidity by adding transverse members that create a three-dimensional box-like structure between the longitudinal beams. This dimensional approach to reinforcement provides structural stiffness without increasing the vertical height of the auxiliary frame, thereby maintaining a low center of gravity and facilitating easy loading and unloading operations.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An auxiliary frame for a motor vehicle having a chassis with two spaced girders extending longitudinally with or without offsets, said auxiliary frame comprising a central box section [1], two side sections [2, 2'] and a plurality of transverse members [3], said central box section [1] comprising four longitudinal sides at least two of which being substantially parallel to one another and having a cross-section with substantially invariable angles perpendicular to the longitudinal axis of said central box section, said central box section comprising at least one box element affixed to one another if at least two box elements and at least two longitudinal plates, two of which are side walls of said box element, with said at least two longitudinal plates having dedicated holes for said transverse members; said plurality of transverse members passing through said holes and being substantially perpendicular to said longitudinal axis; and each of said side sections being affixed to one end of said plurality of transverse members, wherein said central box member is longitudinally mountable on said chassis with fixation means and is provided with coupling plates for a mountable crane; a motor vehicle comprising said auxiliary frame; a method of affixing the above-mentioned auxiliary frame to an entity having longitudinal girders, said method comprising the step of fitting fixation means to said longitudinal girders to accommodate said central box section; and affixing said central box section to said fixation means affixed to said longitudinal girders; and the use of said auxiliary frame for the mounting of a crane.