Speed Change Device Forward-Rotation Idler Gear Support
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Solution Overview
Problem
Existing speed change devices for traveling vehicles require a specific-purpose idler shaft and associated bearings, leading to increased costs and a less compact configuration due to the need for separate support structures for idler gears.
Innovation Solution
A speed change device design that incorporates a forward-rotation idler gear supported on a thrust shaft, eliminating the need for a dedicated idler shaft by using a partition wall bearing, and a hydraulically switching mechanism with oil channels for lubrication and operation, allowing for a more compact and cost-effective configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific-purpose idler shaft and associated bearings are used to support the idler gear, then the idler gear can be properly supported, but the device complexity and cost increase
Solution Approach 1:
The patent merges the idler shaft support function into the existing thrust shaft structure. The idler gear is supported directly on the thrust shaft, eliminating the need for a separate idler shaft. This combining of support functions reduces the number of components while maintaining reliable idler gear support.
Solution Approach 2:
The thrust shaft is given multiple functions: it serves as both the main power transmission shaft and the support shaft for the idler gear. By making the thrust shaft universal, the patent eliminates the dedicated idler shaft while ensuring proper support for the idler gear, thus reducing device complexity without compromising reliability.
2Reliability
If a dedicated idler shaft is provided, then the idler gear is properly supported, but the axial length of the device increases
Solution Approach 1:
The support function for the idler gear is merged into the thrust shaft structure. The idler gear is positioned to be supported directly on the thrust shaft, which eliminates the need for an additional idler shaft extending the axial length. This merging maintains gear support stability while achieving a more compact axial configuration.
3Reliability
If a separate idler shaft and bearing structure are used, then the idler gear can be supported, but manufacturing costs increase
Solution Approach 1:
The patent combines the idler gear support function with the existing thrust shaft, eliminating the need for a separate idler shaft and its associated bearings. This reduction in component count directly lowers manufacturing costs while maintaining reliable idler gear support through the integrated thrust shaft structure.
Solution Approach 2:
By making the thrust shaft universal (serving both as power transmission shaft and idler gear support), the patent reduces the total number of parts that need to be manufactured and assembled. This multi-functionality approach decreases manufacturing complexity and cost while ensuring proper idler gear support.
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 simplifies the support structure, reduces costs, and provides a more compact axial configuration by eliminating the need for a specific-purpose idler shaft and using a forward-rotation idler gear supported by a partition wall, while maintaining efficient power transmission and lubrication.
Implementation Method 1
a second oil channel for supplying compression oil to the mechanism for switching between advancing and retracting to be formed in an interior of the counter shaft
Implementation Method 2
the forward-rotation idler gear is supported by a partition wall of the transmission casing via a first bearing, and a rear end of the thrust shaft is supported by the forward-rotation idler gear via a second bearing
Data Source
AI summary
A speed change device for a traveling vehicle comprising:a thrust shaft connected to an engine;a speed change mechanism for changing between a high and a low speed provided to the thrust shaft;a counter shaft for transmitting an output from the speed change mechanism for changing between a high and a low speed;a mechanism for switching between advancing and retracting provided to the counter shaft, the mechanism having a forward-rotation idler gear rotatably supported on the thrust shaft;a speed change shaft for transmitting reverse-rotation power from the counter shaft as forward-rotation power via the forward-rotation idler gear;a driven shaft provided as an extension to the thrust shaft; anda main speed-change mechanism having a driving gear group provided to the speed change shaft and a driven gear group provided to the driven shaft.