One-Piece Hollow Hub Torque Transmission Assembly
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Solution Overview
Problem
Existing transmission assemblies for railway vehicles increase the size of the bogie, reducing available space for the motor due to their axial bulk, and are complex to produce.
Innovation Solution
A one-piece hollow hub with external and internal toothing, where the shaft is received inside the central housing, allowing for reduced axial bulk and simplified assembly, and a manufacturing method involving molding of the hub and separate production of the shaft components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a transmission assembly with a coupling sleeve and multiple parts is used, then torque can be transmitted from the motor to the reduction unit, but the axial footprint increases and space for the motor is reduced
Solution Approach 1:
The invention merges the coupling sleeve and hub into a single integrated hub component. The hub comprises a housing portion that receives the shaft and an outer portion with gear teeth, eliminating the need for a separate coupling sleeve. This consolidation reduces the axial footprint while maintaining torque transmission functionality through the integrated structure.
2Power
If a transmission assembly with multiple parts and fastening elements is used, then torque transmission is achieved, but the assembly becomes complex to manufacture
Solution Approach 1:
The invention combines multiple components (coupling sleeve and hub) into a single monoblock hub structure that can be manufactured as one piece. This eliminates the need for separate fastening elements and assembly steps, significantly simplifying manufacturing while maintaining the torque transmission function through the integrated housing and gear portions.
3Length of moving object
If a one-piece hollow hub is used, then the axial footprint is reduced and assembly is simplified, but the manufacturing process must be optimized
Solution Approach 1:
The invention incorporates preliminary action by integrating the gear teeth directly into the hub structure during manufacturing. The outer portion of the hub includes gear teeth that mesh with the reduction unit gear, eliminating the need for separate gear assembly steps. This preliminary integration of functional elements simplifies the overall manufacturing process while achieving compact dimensions.
Data Source
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AI summary
The present invention relates to a transmission assembly for transmitting torque from the output of a motor to a reducer, the assembly comprising: - a hollow hub (16) made in one piece, the hub (16) having an external surface (20) and a central housing, the hub (16) having an external toothing (24) extending over the periphery of a part of the external surface (20) and an internal toothing (26) extending over the periphery of a part of the central housing, and - a shaft (18), the shaft (18) having a toothing (38) in projection complementary to the internal toothing (26) of the hub (16) and the shaft (18) being received inside the central housing, so that the toothing (38) of the shaft (18) cooperates with the internal toothing (26) of the hub (16).