Parallel Shift Shaft Actuator for Compact Dual Clutch Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dual clutch transmission gear shifting devices require complex and costly manufacturing processes due to precision cam parts and have a large volume due to perpendicular drive shaft arrangements, making them difficult to miniaturize.
Innovation Solution
A gear shifting device with a parallel arrangement to fork guide rails, using shift forks and a shift shaft with a finger receiving opening, allowing for simplified design, reduced size, and lower manufacturing costs by using shift forks and a shift shaft that pivots and displaces to effect gear shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precision cam parts are used for gear shifting, then gear engagement reliability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical cam mechanisms with a simplified actuator system that uses a shift fork and shift shaft assembly. The actuator directly controls the shift fork to engage and disengage gears, eliminating the need for precision cam parts while maintaining reliable gear engagement through direct mechanical actuation.
Solution Approach 2:
The patent extracts and removes the complex cam mechanism from the gear shifting system, retaining only the essential shift fork and shift shaft components. This extraction simplifies the manufacturing process while preserving the core gear engagement function through a more straightforward mechanical linkage.
2Ease of operation
If perpendicular drive shaft arrangement is used, then gear shifting function is achieved, but transmission package volume increases
Solution Approach 1:
The patent changes the spatial arrangement of the drive shaft from a perpendicular configuration to a parallel configuration relative to the fork guide rails. This dimensional repositioning allows for a more compact transmission package layout, reducing the overall volume occupied by the transmission components while maintaining effective gear shifting operation.
3Manufacturing precision
If complex cam grooves are manufactured with high precision, then shift frame accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent eliminates the complex cam grooves and shift frames from the design, replacing them with a simpler actuator-driven shift fork system. This substitution removes the need for high-precision manufacturing of complex cam contours, significantly reducing manufacturing costs while achieving the same gear shifting accuracy through direct actuation.
Solution Approach 2:
The patent segments the gear shifting function into separate, simpler components: the actuator controls the shift shaft, which independently controls the shift fork. This segmentation allows each component to be manufactured with standard precision rather than requiring high-precision complex cam profiles, reducing overall manufacturing cost.
Data Source
AI summary
A gear shifting device for shifting gears of a transmission includes: at least one guide rail each extending in a longitudinal axis; a plurality of shift effecting members configured to move a plurality of corresponding sliding sleeves coupled to the guide rail for shifting gears, the shift effecting members each having a terminal end portion with a finger receiving opening formed therein, the finger receiving opening extending in a direction generally parallel to the longitudinal axis of the guide rail; and a shift shaft extending in a direction generally parallel to the longitudinal axis of the guide rail, the shift shaft having a shift finger coupled thereto. The shift shaft is rotatable to pivotally position the shift finger at locations aligned with the finger receiving openings of the shift effecting members, and is also displaceable in the longitudinal direction in the finger receiving openings to move the shift effecting members to effect a gear shifting operation.