Power Shift Transmission with Movable Intermediate Gear Set
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Solution Overview
Problem
Existing power shift transmissions require axial movement of the input shaft and drive flange to change transmission stages, which is a disadvantage, and they often rely on shifting elements like dog clutches.
Innovation Solution
A power shift transmission design where the input and output shafts are rotatably and axially immovably mounted, with an intermediate shaft carrying gear wheels that move as a unit to engage and disengage gear wheels between shafts, allowing stage changes without axial input shaft movement and eliminating the need for shifting elements like dog clutches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If axial movement of the input shaft is used to change transmission stages, then transmission stage changing is achieved, but the drive flange must also be axially moved which is a disadvantage
Solution Approach 1:
The transmission system is segmented into fixed shafts (input and output) and a movable intermediate shaft. The intermediate shaft carries the gear wheels that need to be engaged/disengaged, separating the function of power transmission (fixed shafts) from the function of stage changing (movable intermediate shaft). This allows stage changing without moving the drive flange on the input shaft.
Solution Approach 2:
The intermediate shaft acts as an intermediary element between the input shaft and output shaft. It carries the gear wheels (fourth, fifth, and sixth gear wheels) that mesh with the gear wheels on the input and output shafts. By moving the intermediate shaft axially, the desired gear engagements are achieved without requiring axial movement of the input shaft or its drive flange.
2Ease of operation
If shifting elements like dog clutches are used to change transmission stages, then stage changing is achieved, but the device complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for complex shifting elements like dog clutches. Instead, stage changing is achieved through the axial movement of the intermediate shaft, which naturally engages or disengages the gear wheels through their meshing relationships. This simplifies the transmission system by removing specialized shifting components.
Solution Approach 2:
The gear wheels on the intermediate shaft automatically engage or disengage with the gear wheels on the input and output shafts through axial movement of the intermediate shaft itself. The system uses its own structural configuration (the movable intermediate shaft with gear wheels) to achieve stage changing without requiring external shifting elements.
3Ease of operation
If gear wheels are engaged and disengaged during operation, then transmission stage changing is achieved, but reliability may be compromised during the transition
Solution Approach 1:
The sixth gear wheel is designed to maintain continuous engagement with the third gear wheel throughout the entire axial movement path of the intermediate shaft. This preliminary and continuous engagement ensures that power transmission is never interrupted during stage changing. The width of the sixth gear wheel is specifically dimensioned to span the entire movement distance, guaranteeing uninterrupted meshing.
4Stability of the object's composition
If the input shaft is axially immovably mounted, then structural stability is improved, but transmission stage changing becomes more difficult
Solution Approach 1:
The transmission system is divided into fixed components (input shaft, output shaft) and a movable component (intermediate shaft). The input and output shafts are axially immovably mounted to provide structural stability, while the intermediate shaft is designed to be axially movable to enable stage changing. This segmentation allows both stability and operability to be optimized independently.
Solution Approach 2:
The intermediate shaft serves as a mediator that enables stage changing without requiring movement of the fixed input or output shafts. By carrying the gear wheels on the movable intermediate shaft, the system achieves flexibility in gear engagement while maintaining the structural stability of the immovably mounted input and output shafts.
Data Source
AI summary
A power shift transmission, having an input and an output shaft, rotatably and axially immovably mounted and a rotatably mounted intermediate shaft. The input shaft carries first and second gear wheels. The output shaft carries a third gear wheel. The intermediate shaft carries a fourth, fifth, and sixth gear wheels, which are movable such that in a first shifting position the first gear wheel is in engagement with the fourth gear wheel and the sixth gear wheel is in engagement with the third gear wheel, but the second gear wheel and the fifth gear wheel are out of engagement, and in a second shifting position, the second gear wheel is in engagement with the fifth gear wheel and the sixth gear wheel is in engagement with the third gear wheel, but the first gear wheel and the fourth gear wheel are out of engagement.