Final Speed Reducer Breather Chamber Layout for Oil Leakage Control
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Solution Overview
Problem
Existing vehicular final speed reducing devices face challenges in effectively restricting oil flow from the breather chamber due to structural limitations, particularly in the differential gear device where space is constrained.
Innovation Solution
The design incorporates an intermediate wall, rear wall, bottom wall, and side walls within the housing to create a breather chamber that separates air and oil, with specific holes and openings to prevent oil leakage, allowing air to escape while keeping oil contained, even during rotation of the ring gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breather chamber with maze arrangement is formed in the upper portion of the housing, then oil flow restriction is improved, but device complexity increases
Solution Approach 1:
The breather chamber is segmented into two distinct chambers: a first breather chamber and a second breather chamber. The partition wall divides the original breather chamber space, creating separate functional zones. The first breather chamber receives oil from the housing interior through the first opening, while the second breather chamber communicates with the atmosphere through the second opening. This segmentation allows oil to be contained and separated from the atmospheric communication path, effectively restricting oil flow without requiring a complex maze arrangement.
2Reliability
If space in the upper part of the differential gear device is utilized for breather chamber, then oil flow restriction is improved, but available space is limited due to structural restrictions
Solution Approach 1:
The breather chambers are positioned in the axial direction of the ring gear rather than occupying upper radial space. The first breather chamber is disposed axially forward of the ring gear axis, and the second breather chamber is disposed axially rearwards, utilizing the axial dimension of the housing. This dimensional reorientation allows the breather chambers to be formed within the existing housing structure without encroaching on the limited upper space required for differential gear components.
3Device complexity
If the breather chamber is simplified without maze arrangement, then device complexity is reduced, but oil flow restriction effectiveness may be compromised
Solution Approach 1:
The partition wall acts as an intermediary element between the first breather chamber and the second breather chamber. It physically separates the two chambers while allowing controlled interaction through the communication opening. The partition wall prevents direct communication between the housing interior (where oil is present) and the atmosphere, forcing oil to be contained within the first breather chamber. This intermediary structure achieves effective oil flow restriction through a simple chamber division rather than complex maze arrangements.
Data Source
AI summary
In a vehicular final speed reducing device, the intermediate, rear, bottom and the side walls define a breather chamber, and the partition wall divides the breather chamber into auxiliary and primary breather chambers. The auxiliary breather chamber is held in communication with a space outside the breather chamber and within the housing, through a first hole formed through the intermediate wall, and through an opening formed between the intermediate and bottom walls. The primary breather chamber is held in communication with an outside atmosphere outside the housing, and with the auxiliary breather chamber through a second hole formed through the partition wall. The bottom wall extends from the rear wall such that a front end of the bottom wall is located forwardly of the opening in the axial direction of the ring gear.