Work Vehicle Hydraulic Case Segmentation for Sealing and Filtration
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Solution Overview
Problem
Conventional work vehicles with integrated hydraulic continuously variable transmissions face challenges in structural simplification, downsizing, and sealing accuracy due to the need for high sealing capabilities across interconnected case spaces, which can lead to complications and maintenance issues from foreign substances like metal abrasion powder.
Innovation Solution
The configuration includes separate enclosed spaces for the input case and axle cases with independent fuel pumps and filters, preventing the mixing of reservoir oils and allowing for tailored sealing performance, thus enhancing durability and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cases are used for input case and axle cases with independent oil circuits, then sealing accuracy requirements are reduced and maintenance is simplified, but device complexity increases due to multiple pumps and filters
Solution Approach 1:
The patent divides the hydraulic system into separate enclosed spaces: the input case forms one enclosed space and each axle case forms separate enclosed spaces. This segmentation allows each case to have independent sealing requirements, reducing the overall sealing accuracy burden while improving reliability.
Solution Approach 2:
Each enclosed space is equipped with its own fuel pump and filter according to local needs. The input case has one set, and each axle case has its own set, allowing tailored sealing and filtration solutions for each specific location rather than requiring uniform high-level sealing throughout.
2Device complexity
If common reservoir space is used for hydraulic oil and lubrication oil, then structure is simplified, but foreign substances like metal abrasion powder can be sucked into the fuel pump
Solution Approach 1:
The patent segments the oil reservoirs into separate enclosed spaces - the input case reservoir and axle case reservoirs are physically separated. This prevents contamination from metal abrasion powder in one reservoir from being sucked into the fuel pump of another case, eliminating the harmful effect while maintaining structural simplicity.
3Reliability
If separate enclosed spaces with independent fuel pumps and filters are used for each case, then foreign substances are prevented from entering sensitive components, but manufacturing cost increases
Solution Approach 1:
The patent implements segmentation of enclosed spaces with independent fuel pumps and filters for each case. While this increases component count, it provides robust protection against foreign substances entering sensitive components, improving reliability and reducing long-term maintenance costs despite higher initial manufacturing investment.
Data Source
AI summary
A pump supplying reservoir oil reservoired in an input case to devices to be supplied with the reservoir oil and a filter for filtering the reservoir oil circulating in the input case are provided in the input case. A pump supplying reservoir oil in each of left and right axle cases to a hydraulic continuously variable transmission provided in each of the axle cases and a filter filtering the reservoir oil circulating in each of the left and right axle cases are provided in each of the left and right axle cases.