Shift Transmission Layout for More Gear Variants in Less Space
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Solution Overview
Problem
Existing power shift transmissions for agricultural machines face challenges in achieving a high number of gear variants in a compact size while maintaining efficient torque transmission and minimizing shifting actions, which can lead to inefficiencies and increased construction complexity.
Innovation Solution
The proposed shift transmission employs a configuration with a first and second shaft, each having a gear group and range group, where the gear group consists of at least two gear units and the range group consists of at least three range units, allowing for indirect shifting between the first and second range units via a third range unit, enabling compact design and efficient torque transmission with reduced shifting actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a high number of gear variants is implemented, then the versatility and applicability of the transmission is improved, but the device complexity and size increase
Solution Approach 1:
The transmission is divided into separate functional groups: a gear group with multiple gear units and a range group with multiple range units. Each group can be independently shifted, allowing the system to achieve a high number of gear variants through combination rather than requiring a single complex sequential shifting mechanism. This segmentation reduces overall construction complexity while maintaining versatility.
Solution Approach 2:
The gear units and range units are designed with universal engagement capabilities through intermediate shafts. The third range unit can indirectly engage with all gear units, and the system can operate in multiple modes (direct drive, gear reduction, reversing) depending on the configuration of clutches and gearwheel pairs. This multi-functionality allows a compact design to achieve high adaptability.
2Adaptability or versatility
If more gearwheel pairs are used to achieve more gear variants, then the versatility is improved, but the transmission actions and shifting complexity increase
Solution Approach 1:
By segmenting the transmission into gear units and range units that can be independently shifted, the system reduces the total number of sequential transmission actions required. Instead of shifting through a long sequence of gearwheel pairs, the operator can shift gear units and range units more directly, reducing time loss during gear changes.
Solution Approach 2:
Intermediate shafts are introduced as mediators between gear units and range units. These intermediate shafts enable indirect engagement and reduce the number of direct shifting actions needed. The intermediate shafts facilitate smoother and faster gear changes by providing alternative torque transmission paths.
3Adaptability or versatility
If the transmission is designed for a wide field of application, then the adaptability is improved, but the device complexity and size increase
Solution Approach 1:
Multiple functional capabilities (direct drive, gear reduction, reversing, multiple speed ranges) are merged into a single compact transmission design. By combining gear units and range units that share common shafts and intermediates, the system achieves a wide field of application without proportionally increasing size. The shared components reduce overall volume while maintaining versatility.
Solution Approach 2:
The transmission components are designed with universal engagement capabilities. The same gear units and range units can serve multiple functions depending on clutch configuration and engagement patterns. This multi-functionality allows a compact design to accommodate a wide field of application across different agricultural machines and operating conditions.
Data Source
AI summary
A shift transmission includes a first shaft, a second shaft arranged parallel to the first shaft, a gear group arranged at least partially on the first shaft, and a range group arranged at least partially on the second shaft. The gear group includes at least two gear units and the range group comprises at least three range units. Moreover, the gear group and the range group are configured such that a first and a second range unit in each case are shiftable with at least one gear unit indirectly by a third range unit.