Cam Locking Handle Assembly Linear Cable Actuation
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Solution Overview
Problem
Existing manual park release systems, such as Hi-Lex, rely on arcuately pivoting cables, which do not ensure a straight/linear motion of the release cable, limiting the mechanical advantage and efficiency in actuating the park release mechanism.
Innovation Solution
A cable actuating mechanism featuring a rotatable cam element with upper and lower arcuate guiding surfaces and an angularly offset pull handle, ensuring linear translation of the release cable, combined with a torsional spring for counter-rotation and a guide channel network for precise cam follower movement, allowing for efficient actuation of the park release condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If arcuately pivoting cables are used in manual park release systems, then the system structure is simpler, but the cable motion is not linear which limits mechanical advantage and efficiency
Solution Approach 1:
A cam mechanism is introduced as an intermediary component between the pull handle and the release cable. The cam converts the rotational motion from the pull handle into linear motion of the release cable, ensuring straight-line movement that maximizes mechanical advantage while maintaining operational simplicity
Solution Approach 2:
The system is divided into distinct functional components: a pull handle for user input, a cam mechanism for motion conversion, and a release cable for actuation. This segmentation allows each component to be optimized for its specific function, with the cam ensuring linear cable motion independent of the handle's rotational movement
2Reliability
If a rotatable cam element with arcuate guiding surfaces is used, then linear translation of the release cable is ensured, but the device complexity increases
Solution Approach 1:
The cam element incorporates arcuate guiding surfaces with curved geometries that guide the release cable along a linear path. The curved surfaces of the cam are specifically shaped to convert rotational input into straight-line cable movement, ensuring reliable linear translation through geometric design rather than complex mechanical linkages
3Productivity
If an angularly offset pull handle configuration is used, then the mechanical advantage is enhanced, but the ease of operation may be reduced
Solution Approach 1:
The pull handle is positioned at an angular offset from the release cable rather than in a straight-line configuration. This asymmetric arrangement creates a longer moment arm and improves mechanical advantage, allowing the user to apply force more efficiently. The angular configuration optimizes the leverage geometry while the cam mechanism maintains smooth motion transfer
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 enables a straightforward, efficient linear motion of the release cable, enhancing the mechanical advantage and reliability of the park release mechanism, allowing for precise actuation and reset of the park position.
Implementation Method 1
a torsional spring for influencing the cam component in a counter rotating biased direction opposing the engagement cable
Data Source
AI summary
A park release assembly including a package housing with a depth defining base and a cover and a cam component supported in a limited pivotal fashion within the housing. The cam component includes upper and lower portions, each further having an arcuate extending guide surface. A release cable extends in a first direction within the housing and engages the arcuate surface of the lower cam portion. An engagement cable extends in a second crosswise direction relative to the release cable and engages the arcuate surface of the upper cam portion. A pull handle is secured to an end of the engagement cable and, upon outwardly displacing the pull handle, causes concurrent rotation of the cam component in a counter biasing direction in order to linearly displace the release cable in an extending direction in order to actuate a remote lever to a vehicle Park release condition.