Split Transmission Switching Layout for Seamless Torque Transfer
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Solution Overview
Problem
Existing group transmission devices lack the flexibility to advantageously vary and distribute drive moments between main and countershafts efficiently, particularly in power-split operations, and do not allow for seamless gear switching without interrupting rotational torque.
Innovation Solution
The introduction of a third switching unit with an axially shiftable element that connects the first spur gear non-rotationally to the range group's first shaft, along with a blocking switching unit to attach a hollow gear to the planetary carrier, enabling power introduction through both the countershaft and main shaft, and allowing for gear switching without torque interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional group transmission device with limited switching units is used, then the structure is simpler, but the flexibility to vary and distribute drive moments between main and countershafts is insufficient
Solution Approach 1:
The transmission device is divided into functionally independent switching units (first, second, and third switching units), each capable of independently connecting different shafts and gears. This segmentation allows flexible distribution of drive moments between main and countershafts while maintaining a modular structure that manages complexity through functional decomposition.
Solution Approach 2:
The switching units are designed with universal coupling elements that can connect to multiple shafts (main shaft, countershaft, first shaft of range group) and gears (first spur gear, second spur gear). This multi-functionality enables the same switching mechanism to serve different power distribution paths, increasing adaptability without proportionally increasing structural complexity.
2Adaptability or versatility
If gear switching is implemented in existing transmission devices, then different gear ratios are achieved, but rotational torque is interrupted during switching
Solution Approach 1:
The transmission device maintains continuous torque transfer during gear switching by providing multiple parallel power paths through the main shaft, countershaft, and first shaft of range group. When switching between gear configurations, torque can flow through alternative paths, ensuring uninterrupted power transmission and eliminating gaps in the useful action.
Solution Approach 2:
The first shaft of the range group acts as an intermediary element that can receive torque from either the main shaft or countershaft via the third switching unit. This intermediary shaft provides a buffer path that maintains continuous torque flow during transitions between different gear configurations, preventing direct interruption of rotational torque.
3Adaptability or versatility
If the spur gear pair is used only in non-power-branched operation, then the structure is simpler, but the capability for power-branched operation is lost
Solution Approach 1:
The spur gear pair is integrated into a dynamic switching system where the third switching unit can dynamically reconfigure the power flow paths. The same spur gear pair serves different functional roles (power-branched or non-power-branched) depending on the switching state, allowing the system to adapt its complexity to the operational requirements rather than being statically designed for one mode.
Data Source
AI summary
A group transmission device includes a main transmission which has a main shaft, a countershaft and a spur gear pair which includes a first spur gear arranged coaxially and axially overlapping with the main shaft and a second spur gear arranged coaxially and axially overlapping with the countershaft. A range group has a first shaft non-rotationally connected to the main shaft, a second shaft non-rotationally connected to a transmission output shaft, a third shaft and a blocking switching unit. A first switching unit non-rotationally connects the third shaft to a housing. A second switching unit has an axially shiftable switching element and non-rotationally connects the third shaft to the first spur gear. The main shaft is coupled non-rotationally to a transmission input shaft. A third switching unit has an axially shiftable further switching element and non-rotationally connects the first spur gear to the first shaft of the range group.