Planetary Transmission Synchronizer Layout for Compact Gear Shifting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern vehicles face challenges in accommodating transmissions within limited space, necessitating a compact design that enables mechanical synchronization.
Innovation Solution
A transmission design featuring an input shaft, output shaft, and a planetary gearset with a sun gear, ring gear, planet gears, and a coupling disc, utilizing a synchronizer ring to transfer axial motion for gear engagement, allowing for a compact mechanically synchronized transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact transmission design is implemented, then the transmission size is reduced, but mechanical synchronization becomes more difficult to achieve
Solution Approach 1:
The synchronizer ring is nested within the planetary gearset structure, specifically positioned between the ring gear and the coupling sleeve. This nesting allows the synchronizer ring to be integrated into the compact planetary gear arrangement without adding significant axial length, enabling mechanical synchronization while maintaining a compact transmission size.
Solution Approach 2:
The synchronizer ring utilizes radial space within the planetary gearset rather than extending axially. By arranging the synchronizer ring radially between the ring gear and coupling sleeve, the design achieves mechanical synchronization without proportionally increasing the transmission's axial dimension, thus maintaining compactness while enabling synchronization functionality.
2Productivity
If mechanical synchronization is implemented in a compact transmission, then gear shifting efficiency is improved, but the transmission length along the axis increases
Solution Approach 1:
The synchronizer ring is nested within the existing axial boundaries of the planetary gearset, utilizing the radial space between the ring gear and coupling sleeve. This integration ensures that the synchronizer ring does not extend the axial length beyond what is already required by the planetary gearset components themselves.
Solution Approach 2:
The coupling sleeve serves multiple functions: it acts as both the engagement element for connecting the planet gear carrier to the coupling disc and as a structural element that defines the axial boundary. This multi-functionality reduces the need for additional separate components that would increase axial length, while still enabling efficient gear shifting through the integrated synchronizer ring.
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
The design provides a compact transmission format with reduced drag losses and efficient gear shifting, suitable for vehicles with limited space.
Implementation Method 1
a synchronizer ring configured to transfer an axial motion of the ring gear in a first direction towards the coupling sleeve and the coupling disc
Data Source
AI summary
The disclosure concerns a transmission comprising an input shaft, an output shaft, and a planetary gearset. The planetary gearset comprises a sun gear connected to the input shaft, a ring gear that is axially movable, and at least one planet gear rotatably supported on a planet gear carrier that is connected to the output shaft. The transmission comprises a coupling disc connected to the input shaft, an axially moveable coupling sleeve, and a synchronizer ring arranged between the coupling sleeve and the ring gear. The synchronizer ring is configured to transfer an axial motion of the ring gear in a first direction towards the coupling sleeve and the coupling disc. The coupling sleeve is moveable into an engaged position with the coupling disc at least in part by the synchronizer ring.