Cabin Load Path Structure Around Rear Window Lower Corner
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Solution Overview
Problem
Existing working machines, such as hydraulic excavators, are prone to crack formation around the lower corner of the window edge due to applied loads, which compromises the cabin's stiffness and visibility.
Innovation Solution
A load transmitting member comprising a single, continuous structure with an upper pillar part, intermediate part, and beam part is integrated into the cabin's framework, transmitting lateral loads efficiently while avoiding welded joints at the corner, thus preventing crack formation and maintaining cabin stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional cabin structure with window edges is used, then visibility through the window is ensured, but cracks are likely to occur in the corner adjacent portion around the lower corner of the window edge when large loads are applied
Solution Approach 1:
The patent extracts the problematic corner adjacent portion from the load transmission path by introducing a cutout section in the rear wall. This removes the vulnerable area where cracks occur, allowing the load transmitting member to bypass this weak point while maintaining window functionality in the remaining area.
Solution Approach 2:
The load transmitting member acts as an intermediary element that transfers lateral loads from the upper portion of the cabin to the lower portion, bypassing the corner adjacent portion. This mediator prevents direct loading of the vulnerable corner area while maintaining structural integrity.
2Reliability
If the cabin structure is reinforced to prevent crack occurrence, then reliability is improved, but the complexity of the structure increases
Solution Approach 1:
The load transmitting member is merged with the rear wall structure, forming an integrated assembly. This combining of functions (load transmission and structural support) into a single element reduces overall structural complexity while maintaining crack suppression capabilities.
Solution Approach 2:
The load transmitting member serves multiple functions: it transmits lateral loads, provides structural support to the rear wall, and acts as a reinforcement element to prevent cracks. This multi-functionality reduces the need for separate reinforcement components, simplifying the overall structure.
3Stability of the object's composition
If a load transmitting member is added to transmit lateral loads, then cabin stiffness is improved, but the device complexity increases
Solution Approach 1:
The load transmitting member is integrated with the rear wall and window edge structure, forming a unified assembly. This merging eliminates the need for separate attachment components and simplifies the overall cabin framework while maintaining enhanced stiffness.
Solution Approach 2:
The load transmitting member extends in multiple dimensions (vertically along the rear wall and horizontally across the window edge), creating a three-dimensional reinforcement structure. This dimensional approach provides comprehensive stiffness enhancement without requiring additional separate components.
Data Source
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AI summary
A working machine (10) includes a load transmitting member (60) including: an upper pillar part (64); an intermediate part (62) extending to circumvent a window (53) from a position above a lower corner (C1) of a window edge of the window (53) and outer than the lower corner (C1) in a wall width direction (W1) to a position below the lower corner (C1) and inner than the lower corner (C1) in the wall width direction (W1); and a beam part (65) extending so as to be farther away from a wall side edge (E1) under the window (53). The upper pillar part (64), the intermediate part (62), and the beam part (65) are continuous in this order so that a load (F) applied to an upper portion of a cabin (30) is transmitted to an upper frame. At least the intermediate part (62) of the load transmitting member (60) is made of a single member.