Liftgate Latch Linear Cable Switch Mechanism
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Solution Overview
Problem
Existing liftgate systems for motor vehicles lack a reliable and efficient mechanism for automatically opening the liftgate from a closed position to an open position using a handle-actuated power system, which can be cumbersome and unreliable.
Innovation Solution
A latch system with a handle that rotates to move a linear cable switch, allowing a power actuation system to respond and move the liftgate from a closed to an open position, utilizing a biasing member to return the switch to its open position when the handle is released.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a handle-actuated power system is implemented to automatically open the liftgate, then ease of operation is improved, but device complexity increases due to the switch and power actuation system components
Solution Approach 1:
The patent replaces a purely mechanical manual lifting system with an electromechanical power actuation system. The linear cable switch converts mechanical handle rotation into electrical signals that trigger the power actuation system, substituting manual effort with automated motor-driven operation while maintaining simple user interaction through the rotary handle.
2Reliability
If a linear cable switch with biasing member is used to detect handle position, then reliability is improved, but device complexity increases due to additional components
Solution Approach 1:
The biasing member (spring) automatically returns the linear cable switch to its neutral position when the handle is released, providing self-service functionality. This ensures reliable reset of the switch without requiring additional actuators or complex control mechanisms, maintaining reliability while minimizing added complexity.
Solution Approach 2:
The linear cable switch acts as an intermediary between the rotary handle and the power actuation system. It converts rotational mechanical input into linear displacement and electrical signal changes, providing reliable position detection while isolating the complex power system from direct mechanical coupling.
3Ease of operation
If the first contact is movable relative to the second contact to close the switch upon handle rotation, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The linear cable switch employs dynamic elements where the first contact moves relative to the second contact during handle rotation. This dynamic contact arrangement allows the switch to close reliably through the cable's linear displacement, accommodating normal manufacturing tolerances while maintaining operational ease through the mechanical motion built into the switch design.
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 smooth and reliable automatic opening of the liftgate with user-friendly operation, ensuring secure closure and efficient access to the rear cargo area while maintaining secure coupling to the vehicle.
Implementation Method 1
a biasing member, such as a spring, operable to move the switch into the opened position when the handle is released
Data Source
AI summary
A latch system for a liftgate of a motor vehicle. The system includes a handle rotatable relative to the liftgate. The system also includes a switch having a first contact biased apart from a second contact by a biasing member. The first contact is movable relative to the second contact to close the switch upon rotation of the handle. The system further includes a power actuation system in communication with and responsive to the switch to move the liftgate from the closed position to the opened position when the switch is in the closed position.