Hexagonal Frame with Recessed Section for Oblique Load Absorption
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Solution Overview
Problem
Conventional polygonal cross-sectional frames are ineffective in absorbing loads input at angles or obliquely to the frame axis, and rear vehicle body structures require significant space and limited displacement of components during collisions.
Innovation Solution
A hexagonal closed cross-sectional frame with an inwardly recessed section in its L shape design disperses compressive loads both axially and obliquely, and a depressing member is positioned to displace components efficiently in a narrow space, enhancing absorption and displacement capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional hexagonal closed cross-sectional frame is used, then the frame can efficiently absorb compressive load input axially, but it cannot efficiently absorb load input obliquely to the frame axis
Solution Approach 1:
The patent applies asymmetry by creating an L-shaped recessed section in the corner portion of the hexagonal frame, breaking the conventional symmetric hexagonal structure. This asymmetric modification enables the frame to efficiently absorb both axial and oblique loads by providing optimized load dispersion paths in multiple directions, thereby resolving the contradiction between axial load absorption and oblique load adaptability
2Strength
If beads are formed on side surfaces of the frame to improve load absorption, then compressive load absorption is enhanced, but the frame structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The patent extracts the load-absorbing function from the side surfaces (where beads would be formed) and relocates it to the corner portions through the L-shaped recessed sections. This extraction eliminates the need for complex bead formations on side surfaces while concentrating the load absorption mechanism in the corner regions, thereby reducing structural complexity while maintaining enhanced compressive load absorption
3Reliability
If a depressing member is provided over the silencer to prevent interference with the fuel tank, then component protection is improved, but a relatively great dedicated space is required over the silencer
Solution Approach 1:
The patent applies dimensionality change by moving the depressing member from a horizontal arrangement (over the silencer) to a vertical arrangement (within the L-shaped recessed section of the frame). This vertical placement utilizes the depth dimension of the recessed section, allowing the depressing member to be positioned close to the silencer without requiring significant horizontal space, thereby achieving component protection in a compact area
4Area of stationary object
If the depressing member is positioned close to the silencer in a narrow space, then space utilization is improved, but the silencer can only be displaced by a small amount
Solution Approach 1:
The patent applies dynamics by designing the depressing member with a deformable structure that can dynamically change its configuration during collision. The member includes a deformable portion that bends and extends when subjected to impact force, enabling it to achieve large displacement of the silencer despite being positioned in a narrow space. This dynamic deformation mechanism resolves the contradiction between compact positioning and large displacement capability
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 frame effectively absorbs compressive loads from various directions, increasing strength and allowing for greater displacement of components, reducing vehicle height and enhancing impact absorption and housing capacity.
Implementation Method 1
the hexagonal closed cross-sectional shape of the frame being an L closed cross-sectional shape such that the frame has an inwardly recessed section in a corner portion between two leg portions of the L closed cross-sectional shape... the first and second central supporting side portions can advantageously disperse a compressive load (impact) having been input to the end of the frame obliquely to the axis line of the frame
Implementation Method 2
the input compressive load (impact) transmitting toward the center (centroid) of the original rectangular cross-sectional shape of the frame can be efficiently absorbed by deformation of the first and second central supporting side portions
Data Source
AI summary
A polygonal cross-sectional frame has an L closed cross-sectional shape such that the frame has an inwardly recessed section. A rear vehicle body structure includes a depressing member provided, along the lower surface of a rear frame extending rearward from a floor of a passenger compartment, in opposed relation to a predetermined vehicle-body-mounted component part disposed beneath the depressing member. As a rear section of the rear frame deforms due to a load input to the rear end of the rear frame, the depressing member deforms downward to depress and displace the predetermined vehicle-body-mounted component part.