Intermediate Gearshift Arm Layout for Precise Fork Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing actuating devices in gearboxes suffer from imprecision in gearshift positioning due to deformation risks in elongate interface parts, which are mitigated by supporting elements but result in inverted movement direction and positional inaccuracies, particularly undesirable in semi-automatic gearboxes.
Innovation Solution
An internal gearbox actuating device with a main shaft sliding through a casing, featuring a transverse extension that acts on an intermediate arm to move a gearshift fork, where the intermediate longitudinal member is mounted in translation relative to the casing, and includes a tertiary shaft to absorb forces, ensuring precise control through translational guide means and rotation prevention devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a supporting element with pivot link is used to mitigate deformation risk, then reliability is improved, but manufacturing precision deteriorates due to inverted movement direction and positional inaccuracies
Solution Approach 1:
The patent introduces an intermediate arm as a mediator between the selector finger and the gearshift fork. This intermediate arm transmits the movement from the selector finger to the fork without inverting the movement direction, thereby maintaining positioning precision while still allowing for force distribution to mitigate deformation risks in the interface parts.
2Adaptability or versatility
If the interface part length is increased to connect fork and selector finger, then adaptability is improved, but manufacturing precision deteriorates due to increased deformation risk
Solution Approach 1:
The patent segments the connection between the selector finger and the gearshift fork into multiple components: the selector finger, the intermediate arm, and the gearshift fork. This segmentation allows the interface parts to be shorter and stiffer, reducing deformation risk while maintaining the necessary adaptability through the articulated connection provided by the intermediate arm.
3Strength
If a pivot link is used to absorb forces, then strength is improved, but manufacturing precision deteriorates due to positional deviations
Solution Approach 1:
The intermediate arm serves as a mediator that transmits forces from the selector finger to the gearshift fork while maintaining the correct movement direction. The tertiary shaft mounted on the casing absorbs the forces applied to the intermediate arm, preventing positional deviations at the fork while preserving positioning precision.
4Productivity
If the device size is reduced, then productivity is improved, but reliability deteriorates due to increased stress on components
Solution Approach 1:
The patent arranges the components in a compact configuration where the intermediate arm is positioned between the selector finger and the gearshift fork in a way that optimizes space utilization. The tertiary shaft is mounted on the casing to absorb forces, allowing for a compact design that maintains reliability by properly managing component stresses through the force absorption mechanism.
Data Source
AI summary
A device for the internal actuation of a gearbox includes a main axle mounted such that it can slide through a housing, and has a transverse extension capable of acting on an intermediate arm which is designed to conduct a gearshift fork. The intermediate longitudinal member is mounted translationally with respect to the housing.