Manual Transmission Actuation With Extended Shift Elements
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Solution Overview
Problem
Existing manual transmission systems lack flexibility and cost-effectiveness, with limited versatility in gear ratio shifting and increased complexity, weight, and cost.
Innovation Solution
An actuating device with an actuator device connected to a gear shift unit, featuring rotatable and axially displaceable actuating elements that trigger shifting and selecting movements, allowing for more versatile gear ratio engagement and disengagement through gear shift elements with varying lengths and coupling mechanisms, enabling efficient switching between direct and winding gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sequential gear shifting is used, then the transmission structure is simple, but the shifting flexibility and versatility are limited
Solution Approach 1:
The actuating element is segmented into multiple gear shift elements with different lengths, where each element can independently engage or disengage specific gear ratios. This segmentation allows selective activation of winding gear or direct gear functions, providing shifting flexibility without requiring a completely complex transmission structure.
Solution Approach 2:
The actuating device is designed with multi-functionality to perform both sequential shifting and direct gear engagement. The gear shift elements can be selectively positioned to engage winding gears for flexible shifting or direct gears for efficient power transmission, allowing a single device to serve multiple functions and improve versatility without proportionally increasing complexity.
2Adaptability or versatility
If more selecting positions are provided for versatile gear shifting, then the gear ratio selection flexibility is improved, but the transmission length and complexity increase
Solution Approach 1:
Different gear shift elements have different lengths tailored to their specific functions. Elements that need to engage winding gears are longer to reach the appropriate engagement points, while elements for direct gear engagement are shorter. This local differentiation of quality (length) provides versatile gear ratio selection without requiring the entire actuating element to be excessively long.
Solution Approach 2:
The actuating element provides selecting positions that extend beyond what is strictly necessary for basic gear engagement. These additional positions enable direct gear engagement and winding gear selection, providing partial actions that are not always needed but offer flexibility when required, without making the element excessively long in all dimensions.
3Manufacturing precision
If multiple gear shift elements with different lengths are used, then the gear engagement precision is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The actuating element is divided into multiple gear shift elements with different lengths, where each element is responsible for engaging specific gear ratios with high precision. This segmentation allows each element to be optimized for its specific engagement task, improving overall gear engagement precision while keeping the complexity of each individual element manageable.
Solution Approach 2:
The gear shift elements differ in their length parameter, which is optimized for specific engagement requirements. By varying this single parameter (length) rather than redesigning entire elements, the patent achieves precise gear engagement for different gear ratios while minimizing the increase in overall device complexity and manufacturing complexity.
4Adaptability or versatility
If winding gear is used for flexible gear ratio shifting, then the adaptability is improved, but the transmission weight and complexity increase
Solution Approach 1:
The transmission system dynamically switches between winding gear mode and direct gear mode based on operating conditions. The actuating element can selectively engage winding gears when flexible gear ratio shifting is needed or disengage them in favor of direct gears when efficient power transmission is prioritized, allowing the system to adapt its weight characteristics to actual operational needs rather than always carrying the full weight of winding gear mechanisms.
Data Source
AI summary
An actuating device for actuating gear shifting units of a manual transmission has deflectable transmission elements assigned to a respective gear shift unit for changing the gear ratio, a movable actuating element, and gear shift elements assigned thereto. The gear shift elements are movable together with the actuating element and are arranged in two gear shift groups. Dependent on a selecting position of the actuating element, the gear shift elements are coupled with coupling means for deflecting the transmission elements by means of a shifting movement. The shifting movement is independent of the selecting movement. The selecting position can be changed in selecting steps that are delimited by a selecting step length. At least one first gear shift element has an interconnected first gear shift length which is greater than the selecting step length.