Automotive Tow Hook Actuation Gear Mechanism
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Solution Overview
Problem
The operation of existing trailer hitch actuating devices is not ergonomically optimal, posing a safety risk as the gear wheel part must be manually adjusted to change the locking device's position, and leaving it in the operating position can lead to unintended release during trailer operation.
Innovation Solution
An actuating gear that converts rotational motion into axial displacement of the gear wheel part, allowing for sequential axial adjustment between actuated and non-actuated positions, with a blocking mechanism to prevent accidental release, and an optional motorized drive for improved ergonomics and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the gear wheel part is manually adjusted from non-actuated position to actuating position before operating the locking device, then the locking device can be actuated, but the operation becomes complex and time-consuming
Solution Approach 1:
The patent combines the gear wheel part adjustment and locking device actuation into a single integrated operation. The actuating element directly acts on both the gear wheel part and the locking device simultaneously, eliminating the need for separate manual adjustment steps and reducing operational complexity.
Solution Approach 2:
The actuating element serves as an intermediary that transfers the operator's input force to both the gear wheel part and the locking device. This intermediary mechanism coordinates the movement of multiple components through a single actuation action, simplifying the user interface while managing complex internal mechanics.
2Reliability
If the gear wheel part is left in the operating position, then the locking device can be actuated, but accidental release may occur during trailer operation creating safety risks
Solution Approach 1:
The patent implements a blocking mechanism that prevents the gear wheel part from moving in the actuating direction when already in the actuated position. This preliminary protective action blocks potential accidental releases by physically preventing the actuating element from further movement, while still allowing easy manual intervention when needed.
Solution Approach 2:
The blocking mechanism dynamically adapts its blocking force based on operational conditions. During normal trailer operation, the blocking force prevents accidental release. When the operator applies sufficient force to the actuating element, the blocking mechanism yields to allow intentional release, providing both safety and operational flexibility.
3Ease of operation
If a manual actuating device with handwheel is used, then the gear wheel part can be adjusted, but the ergonomic performance is poor
Solution Approach 1:
The patent replaces the manual handwheel mechanical system with a more ergonomic actuating mechanism. The new system uses a lever arm that provides mechanical advantage, allowing the operator to actuate the locking device with less effort and more intuitive motion, while the internal gear mechanism remains integrated and compact.
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
Simplifies the operation of the trailer hitch while maintaining safety by ensuring the locking device remains secure during use, reducing the risk of accidental release and enhancing ergonomic design.
Implementation Method 1
an actuating gear (60) which converts a rotation of an actuating shaft for rotary actuation of the gear wheel part (49) into an axial displacement of the gear wheel part (49)
Data Source
Figure 1~3
Figure 2~4
Figure 5~6
AI summary
An automotive tow hook is engaged and disengaged by a gear operated by rotation of a shaft terminating in a gear wheel that drives axial adjustment. The gear unit is installed in the luggage compartment.