Hood Impact Absorbing Apparatus with Sliding Push-Up Rod
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Solution Overview
Problem
Conventional hood impact absorbing apparatuses are ineffective in mitigating the impact on collision bodies due to limited deformation of the push-up rod, which results in rapid deceleration of collision speed without sufficient energy absorption.
Innovation Solution
The apparatus features a push-up rod that slides along multiple contact portions with varying angles, allowing for increased deformation and frictional energy absorption, enabling gradual deceleration of collision speed and multiple peaks of frictional force to mitigate impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the push-up rod is constrained by a concave receiving surface to prevent lateral deviation, then the rod receives axial load only with minimal deformation, but this results in rapid deceleration and insufficient impact energy absorption
Solution Approach 1:
The push-up rod is designed to transition from a constrained axial load state to a dynamic bending deformation state. The rod is initially positioned to contact the hood at a specific point, but when impact occurs, it is allowed to rotate and bend dynamically, converting the rigid axial load into a flexible bending deformation that absorbs more energy while providing gradual deceleration.
Solution Approach 2:
The invention changes the load type parameter from axial compression to bending moment. By removing the concave receiving surface constraint and allowing the rod to contact the hood at its end portion, the rod experiences bending loads that create larger deformation amounts, thereby increasing impact energy absorption capacity and reducing deceleration rate.
2Strength
If the push-up rod deforms by a small amount under axial load, then the structure remains simple, but the impact energy absorption is insufficient
Solution Approach 1:
The push-up rod utilizes dynamic bending deformation instead of static axial compression. The rod is designed with appropriate flexibility to bend under impact loads, creating a more complex deformation mechanism that significantly increases energy absorption capacity without requiring additional structural components.
3Strength
If the distal end of the push-up rod is prevented from lateral deviation by a concave surface, then the rod maintains axial alignment, but the frictional energy absorption is minimized
Solution Approach 1:
The rod is allowed to dynamically rotate and change orientation during impact, moving from a fixed axial alignment to a dynamic trajectory. This dynamic movement increases the sliding contact distance and frictional force between the rod and hood, thereby enhancing frictional energy absorption while the hood structure provides sufficient guidance to maintain stable interaction.
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
This configuration allows for enhanced energy absorption and mitigation of impacts by increasing the deforming amount of the push-up rod and providing multiple peaks of frictional force, effectively reducing the impact on collision bodies compared to conventional systems.
Implementation Method 1
the impact energy is also absorbed by the movement (i.e., slide contact movement) while receiving friction between the distal end (52H) of the push-up rod (52) and the first slide contact portion (34R)
Implementation Method 2
the push-up rod (52) is gradually folded, and therefore, as compared to the conventional art, a deforming amount of the push-up (52) is larger, and thus the collision speed of the collision body (90) can be gradually decelerated. At this time, the impact energy is not only absorbed (consumed) by the bending deformation of the push-up rod (52)
Data Source
AI summary
The present invention provides a hood impact absorbing apparatus capable of further mitigating an impact that a collision body receives from a hood than ever, wherein a push-up rod pushes up the rear end of a hood at the time of a collision of a vehicle, and when a collision body is battered against the top surface of the hood in this state, the rear end of the hood descends and the distal end of the push-up rod slidingly contacts and moves a rear-side flat portion and an arm intermediate curved portion in the rear end of the hood, and herein, a slide contact angle (θ) in the arm intermediate curved portion is larger than a slide contact angle (θ) in the rear end of the rear-side flat portion, thereby, during a process in which the rear end of the hood descends, peaks at which an absorbing amount of impact energy becomes large can be provided at least twice, and as a result, the impact can be mitigated further than ever.