Welded Transmission Housing for Compact Loader Rigidity
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Solution Overview
Problem
Existing compact tool carrier transmission housing designs lack the necessary rigidity and strength, particularly when using partially welded subassemblies and bolts, which can compromise the structural integrity and efficiency of drive mechanisms.
Innovation Solution
A welded transmission housing design with power drive component cases positioned at the lateral sides, allowing for the mounting of drive motors and components, and incorporating removable external bearing carriers to support drive shafts, along with welded axle housings that form a compact and rigid main frame, capable of accommodating both electric and hydraulic drive motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If partially welded subassemblies and bolts are used in transmission housing construction, then ease of assembly and disassembly is improved, but structural rigidity and strength deteriorate
Solution Approach 1:
The patent merges multiple separate components (transmission housing, axle housings, cross members, chain cases) into a single all-welded assembly. This combining of previously separate bolted subassemblies into one integrated welded structure resolves the contradiction by achieving both structural rigidity through welding and assembly ease through pre-fabricated subassemblies that are welded as complete units rather than individual components.
2Volume of moving object
If drive mechanisms are positioned at the center of the transmission housing, then space utilization is improved, but adaptability to different wheel configurations deteriorates
Solution Approach 1:
The patent segments the drive mechanisms from the central transmission housing by positioning them in lateral chain cases. This segmentation allows the central housing to remain dedicated to power transmission while lateral cases accommodate different wheel configurations (skid steer or steerable wheels), resolving the contradiction between space utilization and adaptability to different wheel configurations.
Solution Approach 2:
The transmission housing is designed with universal adaptability to accommodate both skid steer and steerable wheel configurations. The lateral chain cases and cross members are positioned to support either wheel type, making the same housing structure versatile for different operational modes while maintaining efficient space utilization.
3Strength
If drive shafts are supported with fixed bearings inside the transmission housing, then structural rigidity is improved, but ease of maintenance and adjustment deteriorates
Solution Approach 1:
The patent extracts the bearing carriers from the internal structure of the transmission housing and positions them as removable external components. This extraction allows bearings to be easily removed and replaced for maintenance while the welded housing structure maintains its structural rigidity, resolving the contradiction between structural rigidity and ease of maintenance.
4Manufacturing precision
If chain cases are designed with tight tolerances for chain adjustment, then drive mechanism precision is improved, but device complexity increases
Solution Approach 1:
The patent makes the chain cases adjustable rather than fixed, allowing lateral movement to accommodate chain tension requirements. This dynamic adjustment capability provides the necessary drive mechanism precision without requiring complex adjustment mechanisms, as the entire chain case can be positioned laterally to set chain tension.
Data Source
AI summary
A tool carrier, such as a compact loader, has a main frame formed as a transmission housing that is all welded construction. The transmission housing has drives from motors and drive shafts on each side of the transmission housing. The drives are in enclosed chain cases forming integral parts of the transmission housing. The drive shafts span the power drive cases and are supported on bearings on both ends. The drives in each of the power drive cases drive front and rear axles of the compact loader. Axle tubes also are welded in place on the transmission housing. The rear portions of the transmission housing have support arm castings supported in and closing the ends of the power drive cases. The support arm castings provide support for mounting lift arms for the compact loader.