Pop-up hood connecting portion for vibration suppression
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Solution Overview
Problem
Vehicle pop-up hood devices experience vibration issues when the hood is popped up, leading to instability and potential damage.
Innovation Solution
A vehicle pop-up hood device design that restricts the movement of the second arm with respect to the hinge base using a connecting portion, which is fixed to a region of high rigidity, and incorporates a displacement mechanism to absorb vibration energy, ensuring the hood is securely raised and maintained at the upper limit position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If actuators extend instantaneously to a predetermined length to pop-up the hood, then the hood can be raised quickly to the predetermined position, but the hood will vibrate at the time of completion of the popping-up
Solution Approach 1:
The connecting portion is designed to switch from a stored state to an operating state at the timing of actuator completion, providing restrictive force beforehand to prevent hood vibration. This anticipatory constraint mechanism suppresses the vibration that would otherwise occur when the actuator extends instantaneously.
Solution Approach 2:
The connecting portion acts as an intermediary between the actuator and the hood, mediating the force transmission. It switches states to provide controlled restriction, allowing the actuator to extend quickly while preventing direct transmission of vibrational energy to the hood.
2Stability of the object's composition
If the connecting portion restricts movement of the second arm toward the vehicle upper side, then hood vibration is suppressed, but the device structure becomes more complex
Solution Approach 1:
The connecting portion is integrated with the existing hinge mechanism components (first arm, second arm, hinge base), merging the vibration suppression function into the existing structure. This combination approach provides stability enhancement without adding completely separate complex subsystems.
Solution Approach 2:
The connecting portion employs dynamic state switching between stored and operating states, allowing it to adapt its restrictiveness based on the operational phase. This dynamic behavior provides effective vibration suppression while maintaining flexibility in the overall device structure.
3Stability of the object's composition
If the connecting portion is switched from stored state to operating state at actuator completion, then hood vibration is suppressed, but the control mechanism becomes more complex
Solution Approach 1:
The connecting portion is designed to switch states automatically based on the actuator's operational status. The mechanism self-regulates by detecting actuator completion and transitioning from stored to operating state without requiring external control signals, thereby suppressing vibration through self-service control.
Solution Approach 2:
The state switching mechanism incorporates feedback from the actuator's operational state to determine when to transition from stored to operating mode. This feedback-based control ensures the connecting portion engages at the optimal moment to suppress vibration while maintaining relatively simple control logic.
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 solution effectively suppresses hood vibration during and after the popping-up process, enhancing stability and reducing the risk of damage, while also simplifying the device structure and ensuring compactness.
Implementation Method 1
the connecting portion is switched to an operating state, movement of the second arm toward the vehicle upper side with respect to the hinge base is restricted
Implementation Method 2
the connecting portion has a displacement mechanism that permits displacement toward the vehicle upper side at the other end portion of the connecting portion, and, when a predetermined load toward the vehicle upper side is applied to the other end portion of the connecting portion by the hood that has been raised to the raised position, the displacement mechanism operates and permits displacement toward the vehicle upper side
Data Source
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AI summary
A vehicle pop-up hood device (20) includes: a hinge base (24) that is fixed to a vehicle body; a first arm (26) that is pivotably connected to the hinge base (24); and a second ann (28) that is fixed to a vehicle rear side end portion of a front hood and is pivotably connected to the first ann (26). Further, the vehicle pop-up hood device (20) includes: an actuator that is provided between the first ann (26) and the second arm (28), and that, by being operated, pivots the second ann (28) with respect to the first ann (26); and a connecting portion (50) that, at a time of completion of operation of the actuator, is set in an operating state in which the connecting portion (50) restricts movement of the second arm (28) with respect to the hinge base (24).