Toggle-Joint Flap Actuator for Passive Closed-Position Retention
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Solution Overview
Problem
Flaps in automotive applications are prone to inadvertent actuation due to external forces such as vibrations and air currents, necessitating a mechanism to ensure they remain in the closed position with minimal energy consumption and precise sensor monitoring.
Innovation Solution
A flap actuator with a linkage mechanism incorporating a toggle joint and an elastic element that provides a restoring force to maintain the flap in the closed position, combined with a force sensor for precise position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electric motor is used to actively retain the flap in the closed position, then the flap remains securely closed against external forces, but energy consumption increases
Solution Approach 1:
The elastic element (spring) provides self-service by automatically exerting a restoring force to return the flap to the closed position without requiring active energy input from the electric motor. The motor only needs to overcome this spring force during opening, while the spring handles the closing and retention function passively, significantly reducing energy consumption compared to continuous active control.
Solution Approach 2:
Instead of continuous active control, the system uses periodic action where the electric motor intermittently overcomes the spring force to open the flap when needed, while the spring continuously provides the restoring force. This transforms the control mode from continuous energy consumption to intermittent action, reducing overall energy usage while maintaining reliability.
2Measurement precision
If sensors are added to monitor the closed position and prevent inadvertent opening, then position detection precision improves, but device complexity increases
Solution Approach 1:
The toggle joint mechanism acts as an intermediary that translates the flap's position into a mechanical state that can be detected by simple sensors. The geometric configuration of the toggle joint creates distinct stable states (closed/open) that are easily detectable, allowing precise position monitoring without complex sensor systems. The mechanical linkage serves as a mediator between the flap position and the sensing function.
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 ensures the flap remains securely closed with low energy consumption and provides precise monitoring, allowing for manual override and efficient actuation control.
Implementation Method 1
an elastic element, which exerts a force on the toggle joint when the flap is in its closed position so that the toggle joint causes a restoring force on the flap in the closing direction
Data Source
AI summary
The flap actuator comprises a flap, an actuating drive for opening and closing the flap, and a linkage mechanism comprising a toggle joint comprising a first and second legs rotatably supported at a first and second rotation point, respectively, and rotatably connected to each other at a third rotation point. The second leg includes a guiding slot. The first leg includes a guiding projection engaged and moveably supported in the guiding slot. The toggle joint further comprises an elastic element, which exerts a force on the toggle joint when the flap is closed so the toggle joint causes a restoring force on the flap in the closing direction. Alternatively, or additionally, the guiding slot has a length greater than its width, and the projection is at least partially engaged with the first recess when the flap is closed causing a retaining force and/or a restoring force on the closed flap.