Engine Hood Lock Cam Mechanism for Sequential Actuation
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Solution Overview
Problem
Existing lock arrangements for vehicle components like engine hoods and tailgates are complex and difficult to install, and there is a need for a simpler and more reliable mechanism that allows for controlled unlocking and locking sequences.
Innovation Solution
A lock arrangement with a two-way actuating drive and a cam mechanism that allows for simultaneous or sequential unlocking and locking of a rotary catch and a security element, utilizing a cam with different surfaces for various locking and unlocking sequences, and incorporating a spring element for automatic positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional lock arrangement with separate locking mechanisms is used, then the locking function is reliable, but the device complexity and difficulty of installation increase
Solution Approach 1:
The patent combines the rotary catch mechanism and security element into a single integrated lock arrangement actuated by one two-way actuating drive. The cam mechanism coordinates both locking actions simultaneously or sequentially, reducing the number of independent mechanisms while maintaining reliable locking function through unified control.
Solution Approach 2:
The single actuating drive with two-way actuation performs multiple functions: it can lock the rotary catch, lock the security element, unlock the rotary catch, and unlock the security element. The cam mechanism provides multi-functionality by enabling different locking sequences (simultaneous or sequential) from a single actuator, reducing overall system complexity.
2Manufacturing precision
If multiple separate actuators are used for locking and unlocking, then the control precision is high, but the device complexity increases
Solution Approach 1:
The two-way actuating drive serves as a universal actuator that can control both the rotary catch and security element through two distinct actuation directions. This single multi-functional actuator replaces what would traditionally require separate actuators, maintaining precise control over the locking sequence while reducing device complexity.
Solution Approach 2:
The cam acts as an intermediary mechanism that translates the actuating drive's motion into coordinated locking and unlocking actions. The cam's geometry determines the precise timing and sequence of locking events, providing manufacturing precision without requiring multiple independent actuators.
3Ease of manufacture
If a simple lock mechanism is used, then the ease of installation is improved, but the versatility of locking sequences is reduced
Solution Approach 1:
The cam mechanism provides dynamic adaptability by enabling different locking sequences (simultaneous or sequential locking/unlocking) without changing the physical structure. The two-way actuating drive can operate in different modes, allowing the same simple mechanical structure to achieve multiple locking variants suitable for different application requirements.
4Speed
If simultaneous locking and unlocking is implemented, then the operation speed is improved, but the control complexity increases
Solution Approach 1:
The cam serves as a mechanical intermediary that automatically coordinates simultaneous or sequential locking and unlocking actions. The cam's geometric profile pre-determines the timing and sequence of events, eliminating the need for complex electronic control systems while achieving fast operation through mechanical synchronization.
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
Enables a compact, modular, and easily installable lock system with multiple unlocking and locking variants, ensuring secure operation and efficient actuation through a single actuating drive.
Implementation Method 1
The rotary catch comprises a spring element, in particular a return spring. For example, the rotary catch is held spring-loaded in the position locking the locking element (locked position of the rotary catch) by means of the spring element and the locking mechanism.
Data Source
AI summary
A lock arrangement for an engine hood or a tailgate of a vehicle may have a locking element, a rotary catch for the locking element, a security element for securing the locking element in a secured position of the lock arrangement, a cam for unlocking and locking, and at least one actuating drive. The rotary catch and the locking element are coupled in locking fashion in a closed position of the lock arrangement. The at least one actuating drive may be designed as a two-way actuating drive which interacts with the cam. The cam is formed in such a way that, during the first actuation of the actuating drive, both in one step and in separate steps and in different sequences, the cam unlocks the rotary catch and locks the security element, or conversely the cam locks the security element and unlocks the rotary catch.