Monolithic Track Sub-Frame Casting for Working Machines
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Solution Overview
Problem
Conventional track sub-frames for working machines are expensive to produce due to the assembly of many components and require costly fastening methods, which can compromise structural integrity.
Innovation Solution
The use of monolithic castings for track sub-frames made from weldable materials like steel, with inner and outer members interconnected by cross members, allowing for robust attachment to the main frame structure via welding, thereby enhancing strength and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fabricated track sub-frames are assembled from many components, then the structure can be manufactured with standard fabrication processes, but the production cost increases and structural integrity is compromised
Solution Approach 1:
The patent merges multiple separate components (inner members, outer members, cross members) into a single monolithic casting. This eliminates the need for assembly operations and fasteners, directly resolving the contradiction by providing both ease of manufacture (single casting process) and structural integrity (continuous material without joints)
Solution Approach 2:
The patent employs a composite structure approach by creating a monolithic casting that integrates multiple functional elements (support devices, mounting points, structural members) into one homogeneous steel structure, achieving both manufacturing simplicity and structural strength
2Ease of operation
If track sub-frames are attached by fasteners to the main frame structure, then assembly is simplified, but the attachment strength is reduced
Solution Approach 1:
The patent combines the track sub-frame with the main frame structure through direct welding of the monolithic casting to the main frame. This eliminates the need for separate fasteners while providing superior attachment strength through continuous metal bonding, resolving the contradiction between assembly ease and attachment strength
3Adaptability or versatility
If multiple components are assembled to form track sub-frames, then manufacturing flexibility is improved, but production cost and complexity increase
Solution Approach 1:
The patent merges all sub-frame components into a single monolithic casting, eliminating assembly operations and reducing device complexity. The casting process itself provides manufacturing flexibility through pattern design and material selection, resolving the contradiction between adaptability and complexity
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 approach results in a stronger and more cost-effective track sub-frame structure that is easier to manufacture and assemble, providing optimal strength and durability for working machines.
Implementation Method 1
The inner and outer members and cross members of at least one of the track sub-frames is provided by a monolithic casting of a weldable casting material such as steel. The track sub-frame or frames may be attached to the remainder of the main frame structure by welding
Data Source
AI summary
A working machine has a main frame structure which includes a pair of endless tracks; each track is entrained about track supporting devices mounted by a track sub-frame. The sub-frame includes inner and outer members interconnected by cross members. The inner and outer members are arranged side by side and mounting at or adjacent upper edges thereof, at least one upper track support device between the members. The inner and outer members mount at or adjacent lower edges thereof, at least one lower track supporting device between the members. The inner and outer members and cross members of at least one of the track sub-frames is a monolithic casting.