Recessed Jacking Point Structure for Stable Vehicle Lifting
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Solution Overview
Problem
Existing jacking-up processes can cause vehicles to deform or be damaged due to the contact point of the floor jack going out of the jacking point surface, leading to potential deformation and damage.
Innovation Solution
A jacking point structure with a recessed portion and partial contact surfaces designed to accommodate the jacking device during vehicle inclination, incorporating features like curved surfaces for stress relaxation and sound-and-vibration suppression, and optionally including a protector for collision protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a floor jack is used for jacking up a vehicle, then the vehicle can be lifted, but the contact point may go out of the jacking point surface causing vehicle deformation or damage
Solution Approach 1:
The invention transitions from a single flat jacking point surface to a three-dimensional recessed structure with multiple surfaces. The recessed portion creates depth (z-dimension) with a bottom surface for initial contact and inclined inner side surfaces for lateral support, allowing the jacking device to be constrained in multiple directions and preventing it from going out of position during vehicle lifting.
Solution Approach 2:
The recessed portion acts as an intermediary structure between the vehicle body and the jacking device. It provides a dedicated geometric feature that guides and constrains the jacking device, ensuring proper positioning and preventing lateral movement that could cause the contact point to go out of position.
2Strength
If the jacking point structure is made robust to prevent deformation, then vehicle safety improves, but stress concentration may occur during jacking-up
Solution Approach 1:
The invention introduces curved surfaces at critical locations of the jacking point structure. The curved surface transitions between the bottom surface and inclined inner side surfaces, and additional curved surfaces are provided at the root of the structure. These curved geometries distribute stress more evenly compared to sharp corners, reducing stress concentration while maintaining structural strength.
Solution Approach 2:
The invention modifies the geometric parameters of the jacking point structure by creating a recessed portion with specific depth and inclination angles. This changes the stress distribution parameters during jacking operations, allowing the structure to better absorb and distribute the applied loads, thereby reducing peak stress concentrations.
Data Source
Figure 1~2
Figure 3
Figure 4A~4E
AI summary
In the present invention, a jacking point 13 is formed, by casting, on a lower section of a housing 16 of an electric motor 11 mounted in a vehicle 10. A base section 13a of this jacking point 13 comprises: a jacking point surface 20 that is initially raised by a jack device; and side contact surfaces 22a-22d that are formed on the periphery of the jacking surface 20.