Integrated Rotary Selector Lever for Transmission Mode Locking
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Solution Overview
Problem
Existing selector lever assemblies for vehicle transmissions are complex and costly due to separate components for latching and locking functions, which complicates production and haptic feedback for drivers.
Innovation Solution
A simplified selector lever assembly with an integral, disk-shaped rotary switch that combines latching and locking contours, formed through plastic injection molding, allowing for cost-effective production and enhanced mechanical stability, where the latching contour provides tactile feedback and the locking contour uses stop regions and pins to block specific driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components are used for latching and locking functions, then the reliability and functionality are improved, but the device complexity and production cost increase
Solution Approach 1:
The patent combines separate latching and locking components into a single integrated selector lever assembly. The selector lever incorporates both latching contours (for tactile feedback) and locking contours (for blocking rotation) in one unified structure, eliminating the need for separate latching disks, locking disks, and multiple pins. This merging maintains the reliability of both functions while significantly reducing device complexity and production cost.
Solution Approach 2:
The selector lever is designed as a multi-functional component that simultaneously performs selection, latching, and locking functions. By integrating multiple functions into a single universal component, the patent reduces the overall number of parts required in the system while ensuring that each function (latching for tactile feedback, locking for safety blocking) remains reliable and effective.
2Reliability
If multiple separate components are used for latching and locking, then the functional reliability is improved, but the manufacturing cost and production complexity increase
Solution Approach 1:
The patent merges multiple separately manufactured components (latching mechanism, locking mechanism, selector lever) into a single integrated assembly that can be produced as one unit. This consolidation reduces the number of manufacturing steps, assembly operations, and quality control checkpoints, thereby lowering production cost while maintaining the reliability of driving mode selection through the integrated latching and locking contours.
3Adaptability or versatility
If separate latching and locking components are used, then the functional separation is improved, but the haptic feedback and mechanical play are compromised
Solution Approach 1:
The patent combines latching and locking functions in the selector lever to create optimized haptic feedback. The latching contours provide tactile feedback for mode selection, while the locking contours block rotation in specific positions. By integrating these functions, the design achieves better coordination between tactile feedback and mechanical blocking, improving the overall ease of operation compared to separate components that may create excessive mechanical play or inconsistent haptic responses.
Data Source
AI summary
A selector lever assembly for selecting and shifting to various driving modes in a vehicle transmission may have a rotary switch that is rotatably mounted in a housing, where the driving modes are assigned to the rotational range and separated from one another by a latching contour in a manner that can be felt by a driver, where the rotational movement of the rotary switch can be blocked by a locking contour, and where the locking contour and latching contour are integrally formed on the rotary switch.