Transmission Oil Pipe Positioning for Precise Gear Lubrication
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Solution Overview
Problem
Existing transmissions require increased case size to accurately position oil pipes for lubrication, which complicates assembly and increases size, while maintaining effective oil distribution to gear meshing areas.
Innovation Solution
The transmission incorporates an oil pipe with integral restricting portions that abut against the case inner surfaces to maintain axial and rotational positioning, eliminating the need for bolt holes and pin housing, ensuring precise oil delivery to gear meshing areas without enlarging the case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bolt holes and pin housing holes are formed in the transmission case to position the oil pipe, then the oil pipe can be accurately positioned for oil dripping, but the size of the transmission case increases
Solution Approach 1:
The patent merges the oil pipe positioning function with the case structure by forming the restricting portions directly on the case inner surfaces. The first restricting portion and second restricting portion are integrated into the case design, eliminating the need for separate positioning features like bolt holes or pin housing holes. This integration maintains accurate oil pipe positioning while avoiding the case size increase that would result from adding separate positioning structures.
2Measurement precision
If bolt holes and pin housing holes are formed in the transmission case to position the oil pipe, then the oil pipe can be accurately positioned, but the assembly complexity increases
Solution Approach 1:
The patent combines multiple functions into the case structure itself. The first restricting portion and second restricting portion are formed as integral parts of the case, merging the positioning and support functions into the existing case design. This eliminates the need for separate positioning features and reduces assembly complexity, as the oil pipe can be directly positioned using these restricting portions without requiring additional bolts, pins, or housing features.
3Area of stationary object
If the oil pipe is positioned using restricting portions formed on the case, then case size can be maintained, but the restricting portions must be precisely formed on the case inner surfaces
Solution Approach 1:
The patent integrates the restricting portions into the case manufacturing process itself. By forming the first restricting portion and second restricting portion as integral parts of the case inner surfaces, the positioning features are created during case manufacturing rather than requiring separate machining or assembly steps. This approach maintains case size while the manufacturing precision requirements are met through the case forming process, which can produce the restricting portions with the necessary precision as part of the overall case geometry.
Data Source
AI summary
A transmission includes an oil pipe disposed above a first gear group and a second gear group, the oil pipe having small holes. The oil pipe is formed integrally with a first restricting portion and a second restricting portion, the first restricting portion abutting against an inner surface of a first unit inside a case to thereby restrict an axial position of the oil pipe on an outside in one direction, and the second restricting portion abutting against an inner surface of a second unit to thereby restrict an axial position of the oil pipe on an outside in an other direction and rotation thereof.