Cantilever Switch Assembly for Compact Force-Based Actuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mechanical switches in vehicles require significant motion and occupy large space, posing design challenges for vehicles transitioning to electric propulsion systems, which necessitate additional components like battery packs and electronics.
Innovation Solution
A switch assembly with a cantilever mechanism, utilizing an actuator that rotates to bend a cantilever, where a force sensor measures the induced force, allowing for compact design and intuitive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical switches require a relatively large degree of motion to operate, then the switch can be reliably actuated, but the switch size becomes large and occupies valuable space
Solution Approach 1:
The patent replaces traditional mechanical switch mechanisms with a force sensor-based detection system. Instead of requiring mechanical contact between conductive elements, the system uses a force sensor to detect when a user presses the actuator, eliminating the need for large mechanical motion components and reducing overall switch assembly size while maintaining reliable actuation detection
Solution Approach 2:
The patent changes the detection parameter from mechanical contact position to force magnitude. The force sensor measures the force applied to the actuator, allowing the switch to be triggered by a small displacement combined with sufficient force, rather than requiring a large mechanical motion, thus reducing the switch assembly size while ensuring reliable operation
2Volume of moving object
If the switch size is reduced to save space, then valuable cabin space is preserved, but the switch may become difficult to operate or less intuitive
Solution Approach 1:
The patent changes the actuation parameter from large mechanical displacement to small displacement with force measurement. The force sensor can detect even small presses with sufficient force, making the compact switch just as easy to operate as larger versions. The system monitors force magnitude and duration to ensure intentional activation, maintaining intuitive operation despite the reduced size
Solution Approach 2:
The patent replaces mechanical motion amplification mechanisms with electronic force sensing. The force sensor electronically detects and amplifies the user's input signal, allowing a small, compact actuator to produce a detectable and processable signal, thereby maintaining ease of operation in a reduced-size package
3Device complexity
If traditional mechanical switches are used, then the switch can be simple in design, but the switch requires significant motion and occupies large space
Solution Approach 1:
The patent substitutes mechanical complexity with electronic sensing simplicity. While the force sensor adds a component, it eliminates the need for complex mechanical linkages, springs, and contact mechanisms. The overall design becomes simpler with fewer moving parts, and the electronic force detection requires minimal mechanical structure, significantly reducing the switch assembly size
Solution Approach 2:
The force sensor serves multiple functions: detecting actuation presence, measuring press depth, and determining activation timing. This multi-functionality consolidates what would otherwise require separate mechanical mechanisms, simplifying the overall design while enabling compact dimensions
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 smaller switch assemblies that save space while maintaining functionality and usability, facilitating control of vehicle functions such as seating positions through a compact and efficient interface.
Implementation Method 1
the actuator exerts a second force on the cantilever causing the cantilever to bend about the fixed end
Implementation Method 2
the bending of the cantilever about the fixed end induces a third force exerted on the fixed end and measured by the force sensor
Data Source
AI summary
A switch assembly includes an actuator having an axis of rotation and defining a groove. An interface plate defines a cantilever having a fixed end and a free end, wherein the free end is disposed within the groove of the actuator. The switch assembly further includes a force sensor coupled to the interface plate adjacent the fixed end of the actuator. When a first force causes the actuator to rotate about the axis of rotation, the actuator exerts a second force on the cantilever causing the cantilever to bend about the fixed end. The bending of the cantilever about the fixed end induces a third force exerted on the fixed end which is measured by the force sensor to determine whether the switch has been intentionally actuated by an operator.