Clamped Gear Baffle Assembly for Transmission Windage Reduction
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Solution Overview
Problem
Transmissions in work equipment experience gear windage losses, misalignment, and increased part count and cost due to fasteners, which are susceptible to leakage and complexity, especially under extreme operating conditions.
Innovation Solution
A baffle design with a circumferential shroud wall and annular collar, mounted via clamping force within the gearbox housing, reduces windage and eliminates the need for fasteners by providing a robust seal and anti-rotation features, while maintaining proper part spacing and lubricant containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fasteners are used to mount the baffle, then the baffle can be securely fixed to the gearbox housing, but the part count and manufacturing cost increase
Solution Approach 1:
The baffle is integrated with the gearbox housing as a single piece, eliminating the need for separate fasteners. The baffle mounting features are directly formed on the housing, combining two previously separate components (baffle and housing) into one, thereby reducing part count while maintaining secure mounting
Solution Approach 2:
The gearbox housing serves multiple functions: it contains the gear, provides structural support, and directly provides the mounting features for the baffle through integrated baffle mounting features. This multi-functionality eliminates the need for dedicated fastening components
2Reliability
If fasteners are used to mount the baffle, then the baffle can be securely fixed to the gearbox housing, but the assembly complexity and potential leakage points increase
Solution Approach 1:
By integrating the baffle mounting features directly into the gearbox housing, the patent eliminates multiple fastening components and their associated assembly steps. The single-piece construction reduces assembly complexity and removes potential leakage points that would exist at fastener interfaces
3Reliability
If a traditional baffle design is used, then the gear can be separated from the lubricant, but windage losses and lubrication efficiency are reduced
Solution Approach 1:
The baffle is positioned and shaped to create specific local zones: one zone separates the gear from bulk lubricant to reduce windage, while another zone (through the lubricant delivery feature) ensures proper lubricant delivery to the gear. This local differentiation optimizes both windage reduction and lubrication efficiency
4Device complexity
If the baffle is designed with integrated mounting features, then the part count is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The baffle mounting features are integrated directly into the gearbox housing as a single piece, eliminating the need for separate fasteners. This integration reduces part count while the features are designed to be formed during housing manufacturing, distributing precision requirements across the manufacturing process rather than requiring high-precision assembly of multiple parts
Data Source
AI summary
A work equipment transmission includes a gear, a gearbox, and a baffle. The gearbox housing contains the gear within an internal cavity that defines a sump and is defined by a first housing body having a first baffle-retaining surface and an outlet opening and a second housing body having a second baffle-retaining surface. The baffle has a shroud wall defining a peripheral lip for engagement with the first baffle-retaining surface, an annular collar having an annular collar lip for engagement with the second baffle-retaining surface, and an end wall. The baffle is mounted within the gearbox housing, the end wall extending proximate the gear and the shroud wall extending at least partially around the gear. The baffle is mounted by a clamping force between the first housing body and the second housing body.