Transmission Gearcase Reverse Guide for Bearing Lubrication
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Solution Overview
Problem
The rotation speed of the ring gear when a vehicle moves backward is lower, resulting in reduced oil scraping and potential insufficiency of lubrication to the bearing, which can lead to decreased lubricity.
Innovation Solution
A transmission device configuration that includes a reverse guide mechanism, where a helical gear twists to deliver oil to a catch tank when the ring gear rotates in the backward direction, ensuring consistent lubrication by scraping up oil and guiding it through a reverse guide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the ring gear rotates in the backward direction (second direction), then the vehicle moves backward, but the rotation speed is lower resulting in reduced oil scraping amount and insufficient oil supply to the bearing
Solution Approach 1:
The gear case is divided into multiple functional regions: a forward movement oil supply path (main guide) and a backward movement oil supply path (reverse guide). This segmentation allows the system to handle oil supply differently for forward and backward movements, ensuring adequate lubrication in both directions despite different rotation speeds.
Solution Approach 2:
The reverse guide acts as an intermediary structure that captures oil scraped by the first gear and redirects it to the catch tank. This intermediary mechanism ensures that even at low rotation speeds during backward movement, oil is effectively collected and supplied to bearings.
2Reliability
If the ring gear rotates in the backward direction, then the vehicle moves backward, but the lubricity of the bearing decreases due to insufficient oil supply
Solution Approach 1:
The oil supply system is made dynamic by providing different supply paths for forward and backward movements. The reverse guide is specifically activated during backward movement to ensure adequate oil supply, making the lubrication system adaptive to different operating conditions and rotation speeds.
Solution Approach 2:
The system changes the oil supply parameters (flow path, guiding mechanism) based on the direction of ring gear rotation. During backward movement, the reverse guide is engaged to alter the oil flow characteristics and ensure sufficient lubrication despite lower rotation speeds.
3Reliability
If a reverse guide is added to the gear case, then oil supply during backward movement is improved, but the device complexity increases
Solution Approach 1:
The reverse guide is integrated into the gear case as a unified structure, merging the oil collection and guidance functions into a single component. This reduces the number of separate parts and simplifies manufacturing while still providing the necessary functionality for backward movement lubrication.
Solution Approach 2:
The gear case is designed with multi-functionality, serving both forward and backward movement oil supply requirements through its integrated structure. The reverse guide, while adding functionality for backward movement, is designed to work within the existing gear case framework, minimizing overall complexity increase.
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
This configuration effectively suppresses the decrease in lubricity of bearings during backward vehicle movement by ensuring adequate oil supply, even at lower ring gear rotation speeds.
Implementation Method 1
The first gear is a helical gear twisted so that oil is sent toward the reverse guide when the first gear rotates in the second direction
Data Source
AI summary
Provided is a transmission device capable of suppressing a decrease in lubricity of a bearing. An aspect of the present disclosure is a transmission device including a transmission mechanism and a gear case accommodating the transmission mechanism. The transmission mechanism includes an input gear, a counter gear, and a ring gear. The counter gear includes a first gear and a second gear. The rotation axis of the counter gear is positioned above the rotation axis of the input gear and the rotation axis of the ring gear. The gear case includes a catch tank, a main guide that sends the oil scraped up by the ring gear to the catch tank when the ring gear rotates in the first direction, and a reverse guide that sends the oil scraped up by the first gear to the catch tank when the ring gear rotates in the second direction.