Rail Vehicle Axle Drive Pinion Extraction for Motor Decoupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing axle drive systems in rail vehicles are difficult to maintain and decouple, especially when the motor rotor becomes blocked, leading to costly towing or complex disassembly procedures, which can render the vehicle non-roadworthy.
Innovation Solution
The axle drive design allows for easy decoupling of the motor and wheelset shaft by opening the transmission housing to remove the pinion from the motor shaft, enabling the vehicle to continue operating with other drives, and facilitates pinion removal without disassembling the entire transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor and wheelset shaft are permanently connected through the gearbox, then the drive system is reliable and efficient, but the vehicle cannot operate when the motor becomes blocked and requires expensive towing
Solution Approach 1:
The drive system is segmented into independently controllable components. The pinion can be selectively disengaged from the gear, allowing the motor to be separated from the wheelset shaft. This segmentation enables the vehicle to operate with remaining drives after motor failure, resolving the contradiction between permanent connection reliability and post-failure operability.
Solution Approach 2:
The connection between the motor and wheelset shaft is made dynamic rather than static. The pinion-gear engagement can be actively controlled to connect or disconnect, transforming the drive system from a fixed permanent connection to a configurable dynamic linkage. This allows the system to adapt to motor failure conditions while maintaining normal operation during functional states.
2Ease of repair
If the entire transmission is disassembled to remove the motor, then the defective drive can be removed, but the maintenance process becomes complex and time-consuming
Solution Approach 1:
The pinion is extracted as a separate, removable component from the transmission assembly. By designing the pinion to be independently accessible and removable without disassembling the entire transmission housing, the maintenance process is simplified. The pinion can be removed through an opening in the housing, eliminating the need for complete transmission disassembly while still enabling motor separation.
Solution Approach 2:
The transmission system is segmented into modular components where the pinion serves as an independent serviceable element. This segmentation allows maintenance personnel to access and remove the pinion without dismantling the entire transmission assembly, reducing maintenance complexity and time requirements while still achieving the goal of separating the defective motor.
3Strength
If the pinion is tightly keyed to the motor shaft for secure connection, then the drive connection is strong and reliable, but the pinion cannot be easily removed for maintenance
Solution Approach 1:
The pinion-motor shaft connection transitions from a static permanent keyed connection to a dynamic controllable engagement. The pinion can be engaged securely during operation through the keyway, but can also be deliberately disengaged and removed when maintenance is required. This dynamic characteristic allows the connection to provide full strength during operation while enabling easy maintenance access.
Solution Approach 2:
The keyway design incorporates preliminary features that facilitate both secure engagement and easy disengagement. The keyway geometry and positioning allow the pinion to be tightly keyed during normal operation for maximum strength, while also providing predetermined access paths and engagement features that enable simple removal when maintenance is needed, eliminating the need for forceful or complex removal procedures.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to an axle drive for rail vehicles, comprising the following components or characteristics: a running wheel set shaft (1); - one running wheel set (2, 3) each, which is rotationally fixed on the respective end of the running wheel set shaft (1); - a drive motor (4), which is arranged axially parallel to the running wheel set shaft (1); - a transmission (5), which is arranged between the drive motor (4) and one (2) of the two wheels (2, 3); - the transmission (5) comprises a gear wheel (5, 1), which is non-rotatably connected to the running wheel set shaft (1), a pinion (5, 2), which is non-rotatably connected to the motor shaft and meshes with the gear wheel, and a transmission housing (5, 3); - the transmission housing (5, 3) can be opened in the region of the pinion (5, 2) on the side of the running wheel (2) located there. The invention is characterized by the following characteristics: - the width of the interspace between the pinion (5, 2) and the side of the running wheel facing the same is equal the length of the pinion; - the pinion (5, 2) can be removed from the motor shaft and can be inserted into the interspace.