Spare Tire Mounting Structure for Electric Vehicles
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Solution Overview
Problem
The reduction in spare tire well size due to larger battery sizes in electric vehicles poses a challenge in stably mounting a spare tire, as existing solutions do not effectively utilize limited space while maintaining regulatory compliance in emerging countries.
Innovation Solution
A spare tire mounting structure that includes a well portion in the rear floor panel with a jack device, support bars, and a mounting bracket, allowing the spare tire to be detachably mounted and supported by the jack device between the luggage board and the base surface of the rear floor panel, with a guide for the jack's movement and support pads for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If large-capacity batteries are installed to increase electric vehicle range, then the battery size increases, but the spare tire well size is reduced
Solution Approach 1:
The jack device is designed to be movable within the well portion, capable of moving forward and backward along the guide and being raised and lowered. This dynamic positioning allows the jack to adapt to different spare tire positions and sizes, maximizing the utilization of the limited well space while maintaining support functionality
Solution Approach 2:
The support structure utilizes multiple spatial dimensions by positioning support bars across the well portion and arranging support pads at different locations (front, rear, and side walls). This three-dimensional arrangement optimizes space utilization within the constrained well volume
2Volume of stationary object
If the spare tire well size is reduced, then luggage capacity is improved, but the ability to stably mount a spare tire deteriorates
Solution Approach 1:
The jack device combines multiple functions into a single unit: it provides vertical support through the raised platform, horizontal positioning through movement along the guide, and structural stability through cooperation with support bars and pads. This integrated design ensures stable spare tire mounting within the limited well space
Solution Approach 2:
The jack device acts as an intermediary between the spare tire and the well portion structure. It transfers the load from the spare tire to the well portion through its support platform, while the guide and support bars provide additional mediation for positioning and stabilization
3Adaptability or versatility
If a movable jack device is used to support the spare tire, then adaptability to limited space is improved, but device complexity increases
Solution Approach 1:
The mounting structure is divided into separate functional components: the jack device for vertical support, the guide for horizontal movement control, support bars for lateral stability, and support pads for positioning. This segmentation allows each component to perform its specific function independently, simplifying the overall system while maintaining adaptability
Solution Approach 2:
The jack device serves multiple functions: it supports the spare tire vertically, positions it horizontally along the guide, and works in conjunction with support bars and pads for stabilization. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity while maintaining adaptability
Data Source
AI summary
A spare tire mounting structure includes: a well portion in a rear floor panel of a vehicle body; a jack device which is detachably mounted within the well portion, and is raised or lowered within the well portion; a plurality of support bars mounted across the well portion; and a mounting bracket coupled to the plurality of support bars, wherein a spare tire is detachably mounted on the mounting bracket by a clamp, and is supported by the jack device.