Turn Signal Auto-Cancel Toggle for Consistent Null Reset
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Solution Overview
Problem
Existing vehicle turn signal cancel mechanisms often fail to efficiently reset to a null position when the steering column is rotated in the opposite direction of the signaled turn, leading to inconsistent and potentially confusing signal cancellations.
Innovation Solution
A steering assembly with a toggle mechanism that includes a cancellation member and a cancellation rib, which axially and rotationally operates to selectively engage and disengage, allowing the turn signal stalk to return to a null position from right-turn or left-turn positions based on steering wheel direction, utilizing a spring bias to maintain the toggle in a rest position offset from the cancellation rib.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional turn signal cancel mechanism is used, then the mechanism can reset to null position, but the reset is inconsistent and unreliable
Solution Approach 1:
The toggle mechanism transitions from a static positioning system to a dynamic one where the cancellation member axially moves along the steering shaft rotation. This dynamic adjustment allows the cancellation member to selectively engage or disengage from the cancellation rib based on rotation direction, ensuring reliable reset only when appropriate, thereby improving reset consistency while maintaining smooth operation.
Solution Approach 2:
The toggle acts as an intermediary mechanism between the steering shaft rotation and the turn signal stalk positioning. It mediates the cancellation action by using the axially-operable cancellation member to selectively engage the cancellation rib, translating rotational motion into controlled positional changes that ensure reliable and smooth signal cancellation.
2Ease of operation
If the cancellation member is always engaged with the cancellation rib, then the toggle is constrained, but the turn signal cannot be properly positioned in right-turn or left-turn positions
Solution Approach 1:
The cancellation member's axial position is dynamically adjusted based on the turn signal's operational state. When the turn signal is in right-turn or left-turn positions, the toggle rotates to axially offset the cancellation member from the cancellation rib, allowing free positioning. When cancellation is needed, the toggle rotates to axially align the cancellation member with the cancellation rib for engagement. This dynamic positioning simplifies the mechanism while enabling both positioning and cancellation functions.
3Reliability
If the toggle is biased toward engagement with the cancellation rib, then cancellation is reliable, but the turn signal cannot be held in turn positions
Solution Approach 1:
The spring bias continuously pushes the cancellation member toward axial engagement with the cancellation rib, ensuring reliable cancellation when needed. However, the toggle's rotational movement dynamically changes the axial alignment between the cancellation member and cancellation rib. When in turn positions, the toggle rotates to offset axial alignment, allowing the spring bias to be ineffective and the turn position to be held. This dynamic geometric relationship provides both reliable cancellation and proper turn position holding without contradiction.
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
Ensures smooth and consistent auto-canceling of turn signals by accurately resetting the turn signal stalk to a null position, reducing confusion and enhancing driver safety by aligning with steering wheel movements.
Implementation Method 1
A spring that biases the toggle away from the trunnion and in a direction parallel with the rotational axis
Data Source
AI summary
A steering assembly for a vehicle includes a housing having a signal portion and defining a shaft enclosure. A steering shaft includes a cancellation rib that rotates about a rotational axis and within the shaft enclosure. A trunnion rotates within the signal portion of the housing about a trunnion axis to define a null position and right-turn and left-turn positions. A toggle includes a cancellation member. The toggle axially and rotationally operates with respect to one of the trunnion and the turn-signal housing. The cancellation member in the null position is within the shaft enclosure and axially offset from the cancellation rib. The cancellation member in one of the right-turn and left-turn positions is within the shaft enclosure and axially aligned for selective engagement with the cancellation rib. Selective engagement of the cancellation rib and the cancellation member axially operates the toggle to the null position.