PTO Transmission Case Segmentation for Assembly Stability
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Solution Overview
Problem
Conventional PTO system transmission mechanisms face difficulties in efficiently assembling the PTO clutch unit due to long axial lengths of the PTO clutch unit and PTO driven shaft, leading to instability and wasted space, complicating the structure and making it troublesome to arrange the brake mechanism.
Innovation Solution
A PTO transmission structure with a transmission case design that includes first and second walls with holes for supporting the PTO driving and driven shafts, allowing the PTO clutch unit to be positioned between them, facilitating easier assembly and maintaining stability, and incorporating a hydraulic clutch mechanism with a brake mechanism that can be easily arranged without adding complexity to the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the PTO clutch unit and PTO driven shaft are incorporated through a single opening in the transmission case, then the assembly structure is simplified, but the assembling task becomes troublesome and the supporting distance becomes excessively long
Solution Approach 1:
The transmission case is divided into a case main body and a lid member that can be separated. The PTO clutch unit and PTO driven shaft are assembled in the case main body through a first opening, then the lid member is attached separately. This segmentation allows the assembly process to be divided into manageable steps, improving ease of manufacture while maintaining structural simplicity.
Solution Approach 2:
The PTO clutch unit and PTO driven shaft are preliminarily assembled in the case main body before attaching the lid member. This preliminary action allows the assembly to be prepared in advance, making the final assembly process easier and more efficient.
2Area of stationary object
If the PTO clutch unit and PTO driven shaft are supported by the wall and lid member, then the assembly can be contained, but the supporting distance becomes long and stability deteriorates
Solution Approach 1:
Instead of supporting the PTO clutch unit and PTO driven shaft only at the ends along the axial direction, the invention introduces support points on the peripheral surface of the case main body. This adds support in a radial dimension, creating a more stable triangular support configuration that reduces the effective supporting distance and improves assembly stability.
3Length of stationary object
If the PTO clutch unit is positioned above the differential gear unit, then the transmission case length increases, but space is created for assembly access
Solution Approach 1:
The transmission case is segmented into a case main body and a lid member that can be separated. This allows the PTO clutch unit to be assembled in the case main body without requiring excessive length, as the lid member can be attached after assembly. The segmentation enables compact positioning while maintaining assembly accessibility.
4Ease of operation
If the fixed part for the brake mechanism is arranged in the conventional configuration, then the brake mechanism can function, but the transmission case main body structure becomes complicated
Solution Approach 1:
The peripheral surface of the case main body is designed to serve multiple functions: it provides support for the PTO clutch unit and PTO driven shaft, and simultaneously serves as the mounting location for the fixed part of the brake mechanism. This multi-functionality eliminates the need for separate structural elements, simplifying the transmission case main body while maintaining brake mechanism functionality.
Data Source
AI summary
There is provided a PTO transmission structure including a PTO driving shaft operatively connected to a driving source, a PTO driven shaft arranged in a downstream side in a transmission direction of the PTO driving shaft, a PTO clutch unit for selectively performing power transmission/power interruption from the PTO driving shaft to the PTO driven shaft, and a transmission case for supporting the PTO driving shaft and the PTO driven shaft and for accommodating the PTO clutch unit. The transmission case has a case main body which includes a first wall having a first hole for supporting the PTO driving shaft, and a second wall having a second hole for supporting the PTO driven shaft, the second wall being spaced apart from the first wall so as to define a first accommodating space to position the PTO clutch unit between the first wall and the second wall. The PTO clutch unit includes a drive-side member operatively connected to the PTO driving shaft, and an output shaft member operatively connected to the PTO driven shaft. Each of the PTO driving shaft and the PTO driven shaft is connected to the drive-side member and the output shaft member, respectively, of the PTO clutch unit by inserting the PTO driving shaft through the first hole from the upstream side in the transmission direction of the first wall and inserting the PTO driven shaft through the second hole from the downstream side in the transmission direction of said second wall with said PTO clutch unit positioned in the first accommodating space.