Vehicle Transmission Case Segmentation for Assembly
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Solution Overview
Problem
Conventional traveling system transmission structures face challenges in assembling the planetary gear unit and forward/rearward-travel switch unit due to radial enlargement requirements and need strict accuracy in manufacturing and control to achieve vehicle stop states, which complicates the process and increases costs.
Innovation Solution
The transmission case design includes a front opening for the planetary gear unit and a rear opening for the forward/rearward-travel switch unit, with an intermediate bearing wall to improve assembly efficiency and reduce the size of the planetary gear unit, allowing for a desired speed reduction ratio without enlarging it, and incorporates a hydraulic brake unit for reliable vehicle stop states without strict manufacturing or control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the clutch shaft is designed to support both the planetary gear unit and the forward/rearward-travel clutch mechanism with integral rear support wall, then the structural rigidity is improved, but the radial size of the planetary gear unit is enlarged and the assembly difficulty increases
Solution Approach 1:
The transmission case is divided into front and rear detachable parts, allowing the planetary gear unit and forward/rearward-travel switch unit to be assembled separately and then combined, reducing assembly difficulty while maintaining structural integrity
Solution Approach 2:
An intermediate bearing wall is introduced as a separate component between the front and rear support walls, serving as an intermediary structure that supports the clutch shaft without requiring integral construction, thereby avoiding radial enlargement of the planetary gear unit
2Ease of manufacture
If the front support wall is detachably connected to accommodate the planetary gear unit from the front, then the assembly ease is improved, but the manufacturing complexity increases
Solution Approach 1:
The transmission case is segmented into front and rear detachable parts with a front opening, enabling the planetary gear unit to be assembled from the front without requiring complex disassembly or special assembly tools, while the segmentation itself is designed to be straightforward for manufacturing
3Productivity
If the planetary gear unit and forward/rearward-travel switch unit are assembled together before installation, then the assembly efficiency is improved, but the difficulty of assembly increases due to radial enlargement
Solution Approach 1:
The transmission case is divided into front and rear detachable parts that can be separated, allowing the planetary gear unit and forward/rearward-travel switch unit to be assembled independently on respective shafts and then installed together as a integrated assembly, improving efficiency without increasing difficulty
Solution Approach 2:
The assembly approach transitions from radial assembly (which requires large clearance due to radial enlargement) to axial assembly through the front opening, utilizing the axial dimension to bypass the radial size constraint and enable efficient assembly of the combined unit
Data Source
AI summary
The traveling system transmission structure for vehicle includes a planetary gear unit, a forward/rearward-travel switch unit and a transmission case. A front end portion of a sun gear shaft is directly or indirectly supported by a front bearing wall that is detachably connected to a front side of the transmission case and a rear end portion of a planetary outputting member is directly or indirectly supported by an intermediate bearing wall, so that the planetary gear unit is accommodated in a front chamber that is sandwiched by the front bearing wall and the intermediate bearing wall. A front end portion of a forward/rearward-travel input shaft is directly or indirectly supported by the intermediate bearing wall and a rear end portion of a clutch shaft is supported by a rear bearing wall that is detachably connected to the rear side of the transmission case, so that the forward/rearward-travel switch unit is accommodated in a rear chamber that is sandwiched by the intermediate bearing wall and the rear bearing wall.