Transfer Device Guide Section for Lubrication Retention
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Solution Overview
Problem
Traditional transfer devices in four-wheel-drive vehicles require separate lubricating oil, leading to complex fluid circulation channels and inefficient lubrication.
Innovation Solution
The transfer device incorporates a guide section to direct lubricating oil scooped up by the final driven gear into the transfer case, utilizing tapered roller bearings and suppression plates to retain fluid, and a recessed section to bypass fluid to the bearing lubrication groove, simplifying the configuration and improving lubrication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated lubricating oil system is used for the transfer device, then the transfer device can be lubricated, but the fluid circulation channel becomes complex and the configuration becomes complicated
Solution Approach 1:
The patent merges the lubrication system of the transfer device with the lubricating oil circulation system of the final driven gear. The transfer case is configured to receive lubricating oil that has been scooped up by the final driven gear, eliminating the need for a separate dedicated lubricating oil system. This integration simplifies the overall fluid circulation channel while ensuring reliable lubrication for both components.
Solution Approach 2:
The lubricating oil circulation system is designed to serve multiple functions simultaneously. The same lubricating oil that lubricates the final driven gear is also used to lubricate the transfer device components, including the bevel gears and bearings. This multi-functional approach reduces system complexity while maintaining effective lubrication.
2Ease of manufacture
If the transfer case is positioned without considering fluid flow, then the structure is simple, but the lubricating oil cannot be retained sufficiently for effective lubrication
Solution Approach 1:
The transfer case incorporates localized structural features specifically designed to control fluid flow and retention. A weir section is provided on the inner peripheral surface of the transfer case to prevent lubricating oil from flowing out toward the final driven gear side. Additionally, guide sections are configured to direct the scooped-up lubricating oil into the transfer case. These localized modifications ensure adequate lubrication retention without significantly complicating the overall structure.
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 simplifies the transfer device's design, enhances lubrication retention, and improves the lubrication of bearings, reducing the need for dedicated lubricating oil and enhancing the fluid circulation channel's efficiency.
Implementation Method 1
a guide section (e.g., the through hole 61h of the embodiment, which applies hereinafter) guiding into the transfer case at least part of the fluid scooped up by the final driven gear (e.g., the lubricating oil of the embodiment, which applies hereinafter)
Implementation Method 2
a weir section (e.g., the weir section 69 of the embodiment, which applies hereinafter) is provided on an inner peripheral surface of die transfer case so as to suppress the fluid flowing out of the transfer case into final driven gear side
Implementation Method 3
a suppression plate (e.g., the suppression plate 88 of the embodiment, which applies hereinafter) is provided, the suppression plate suppressing leakage of the fluid between the bearings toward the second bevel gear such that the fluid between the bearings is retained
Data Source
AI summary
Provided is a device that includes a transfer input gear meshing with a final driven gear, a transfer input shaft pivotally supporting the transfer input gear, a first bevel gear provided on the transfer input shaft, a second bevel gear meshing with the first bevel gear, a transfer output shaft pivotally supporting the second bevel gear, a transfer case covering at least the first bevel gear and the second bevel gear, and a guide section guiding at least part of scooped fluid that is scooped up by the final driven gear into the transfer case.