Cab Corner Reinforcement Using Embedded Rib Member
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Solution Overview
Problem
The existing cab designs for hydraulic excavators, such as those described in Japanese Patent Laying-Open No. 2011-105032, face challenges in securing a wide internal space while maintaining structural rigidity due to the placement of gusset plates that can invade the available space.
Innovation Solution
The design incorporates a rib member embedded in the pillar and beam members at the intersection points, which increases the connection strength and suppresses deformation, thereby securing a wide internal space and enhancing the structural rigidity of the cab.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a gusset plate is placed at the corner portion where pillars and beam member are connected to increase strength, then the connection strength is improved, but the internal space of the cab is greatly invaded
Solution Approach 1:
The rib member is embedded within the corner portion structure itself, nesting the reinforcement element inside the existing structural envelope rather than adding it externally. This allows the rib member to strengthen the corner connection while occupying minimal additional space that does not intrude into the cab's internal volume
Solution Approach 2:
The rib member extends in the thickness direction of the plate member, utilizing the Z-dimension (depth) rather than occupying additional X-Y plane space. This dimensional approach allows reinforcement without reducing the horizontal internal space of the cab
2Stability of the object's composition
If the cab structure is reinforced with additional members, then the rigidity is improved, but the device complexity increases
Solution Approach 1:
The rib member integrates multiple functions into a single structural element: it reinforces the corner connection, connects the pillar and beam member, and utilizes the thickness of the plate member. This merging approach achieves rigidity enhancement without adding separate complex components
Solution Approach 2:
The rib member is placed specifically at the corner portion where reinforcement is most needed, providing localized strengthening rather than requiring comprehensive reinforcement of the entire cab structure. This targeted approach maintains overall structural simplicity while achieving the desired rigidity
Data Source
AI summary
A cab includes: a pillar member; a beam member; and a rib member. The pillar member extends in an up-down direction. The beam member extends in a left-right direction. The beam member is connected to an upper end of the pillar member. The rib member is provided at a corner portion where the pillar member and the beam member intersect with each other. The rib member is connected to the pillar member and the beam member. The rib member is embedded in at least one of the pillar member and the beam member.