PBV Frame Structure for Short-Overhang Crash Buffer and Power Unit Space
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Solution Overview
Problem
Purpose built vehicles (PBVs) with short overhangs face challenges in securing sufficient buffer performance against front collisions and mounting space for power units, while maintaining effective structural support for chassis components.
Innovation Solution
A frame structure comprising main and auxiliary side members, cross members, and vertical members that gradually rise towards the front, with a power unit bracket and suspension support systems, designed to enhance collision performance and provide mounting space for power units and chassis parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the vehicle is designed with a short overhang to maximize interior space, then the interior space is increased, but the front collision buffer performance deteriorates
Solution Approach 1:
The frame is segmented into main side members and auxiliary side members positioned at different heights. The auxiliary side members extend forward from the main side members, creating a stepped configuration that provides collision buffer space without increasing the overall vehicle overhang, thus resolving the contradiction between interior space and collision performance.
Solution Approach 2:
The frame structure utilizes vertical dimension by positioning auxiliary side members below the main side members. This vertical stacking allows the collision buffer to occupy vertical space rather than horizontal space, maintaining short overhang while providing adequate buffer performance.
2Volume of moving object
If the vehicle is designed with a short overhang, then the interior space is maximized, but the space for mounting power unit deteriorates
Solution Approach 1:
The power unit mounting space is created in the vertical dimension by positioning the power unit between the main side members (upper) and auxiliary side members (lower). This vertical arrangement provides adequate mounting space without extending the vehicle overhang horizontally.
Solution Approach 2:
The frame is divided into upper main side members and lower auxiliary side members, creating distinct zones. The power unit is mounted in the space between these segmented parts, providing dedicated mounting area while maintaining compact overall dimensions.
3Reliability
If the frame structure is designed to provide collision buffer performance, then the front collision performance is improved, but the structural complexity increases
Solution Approach 1:
The auxiliary side members serve multiple functions: they provide collision buffer performance by extending forward, create mounting space for power units through vertical positioning, and offer attachment points for chassis components. This multi-functionality reduces overall structural complexity while achieving multiple goals.
Solution Approach 2:
The collision buffer function and power unit mounting function are merged into the same frame structure. The space between main and auxiliary side members simultaneously provides both collision buffer and power unit mounting capabilities, reducing the need for separate structural elements.
Data Source
AI summary
A frame structure for a purpose built vehicle (PBV) includes: two main side members extending while gradually rising toward a front of the PBV and extending in a front/rear direction to be disposed on either side of the PBV; two auxiliary side members respectively extending in a front/rear direction to be disposed on a lower side of the two main side members; a front cross member connecting the two auxiliary side members in a lateral direction of the PBV; and a plurality of vertical members respectively connecting the main side members and the auxiliary side members in a vertical direction.