Bogie Reducer Lubrication via Vertical Oil Reserve
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Solution Overview
Problem
Conventional reducers used in mechanical systems, particularly in railway vehicles, face geometric constraints that require compact designs while ensuring effective lubrication of bevel gears, which are prone to friction and require larger dimensions due to oil reserve placement at the bottom of the casing.
Innovation Solution
A reducer design with a first and second shaft arranged at different heights, where the intermediate shaft is housed in a chamber with a lubricant-filled bubble tank, and a reserve tank in fluid communication with the bubble tank through ducts, allowing effective lubrication of the gear elements and reducing the width of the lower part of the reducer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil reserve is located in the lower part of the casing to ensure effective lubrication of bevel gears, then the lubrication effectiveness is improved, but the width of the lower part of the reducer increases
Solution Approach 1:
The invention transitions from a horizontal oil reserve layout (occupying width) to a vertical layout (occupying height). The oil reserve is positioned in the upper part of the casing above the intermediate shaft, and lubrication is achieved through vertical gravity-fed flow paths via ducts, eliminating the need for horizontal expansion while maintaining lubrication effectiveness.
Solution Approach 2:
Instead of placing the oil reserve in the conventional lower position to facilitate lubrication, the invention inverts the arrangement by positioning the oil reserve in the upper part of the casing. The lubrication system is designed to convey oil downward from the upper reserve through ducts to the gear elements, reversing the traditional spatial arrangement while achieving the same functional goal.
2Adaptability or versatility
If the shafts are arranged at different heights in separate casings to allow relative movement, then the adaptability is improved, but the overall dimensions of the reducer increase
Solution Approach 1:
The invention merges multiple shafts operating at different heights into a single integrated casing rather than using separate casings. The first shaft, second shaft, and intermediate shaft are all housed within one unified casing structure, allowing relative movement between shafts while maintaining a compact overall dimension.
Solution Approach 2:
The invention nests the intermediate shaft and its associated gear elements within the chamber of the casing, positioned between the first and second shafts vertically. This nested arrangement allows multiple shafts to coexist in a compact configuration, with the intermediate shaft effectively nested within the spatial envelope defined by the other components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves effective lubrication of the gear elements while minimizing the width of the reducer's lower part, enhancing its compactness and reliability by using a lubricant supply system that prevents disturbances and ensures efficient lubricant distribution.
Implementation Method 1
The first gear element is at least partially immersed in the first bubble tank
Implementation Method 2
the oil projected on the walls of the crankcase is recovered by gravity
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a reducer comprising a first shaft, a second shaft (20), an intermediate shaft (25) transmitting the motion from the first shaft to the second shaft (20) and a housing (30) delimiting a chamber (32), the first shaft and the second shaft (20) each extending at least partially out of the housing (30), the intermediate shaft (25) being accommodated in the chamber (32) and comprising a first gear element (70) cooperating with the first shaft and a second gear element (75) cooperating with the second shaft (20), The first shaft and the intermediate shaft (25) are arranged at a first height, the second shaft (20) being arranged at a second height lower than the first height, and the reducer (10) comprises a splash tank (80) containing a lubricant, the first gear element (70) being at least partially immersed in the splash tank (80).