Key Plate Guided Positioning for Cab Riser Fastening
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Solution Overview
Problem
Existing work machines face challenges in accurately positioning and securely fastening the cab riser to the main body during transitions from transportation to operation positions, leading to potential material yield issues and risk of fastening member failure due to shearing forces.
Innovation Solution
The implementation of a key plate with slope surfaces and a recessed design between two plates allows for guided positioning and secure fastening, reducing lateral displacement and shearing forces on fastening members, while improving material yield through a more efficient manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complicated protrusion shapes (e.g., quadrangular pyramid, truncated cone) are used for positioning and fastening, then positioning accuracy and fastening reliability are improved, but material yield decreases due to complex manufacturing requirements
Solution Approach 1:
The positioning and fastening function is segmented into two separate components: a positioning guide structure (with simple cylindrical or rectangular protrusions) and a fastening structure (with holes for fastening members). This segmentation allows each component to have a simple geometry that is easy to manufacture with high material yield, while collectively achieving both accurate positioning and secure fastening.
Solution Approach 2:
The positioning guide structure acts as an intermediary element that facilitates the accurate positioning of the cab riser relative to the main body before the fastening members are installed. This intermediary positioning mechanism enables subsequent secure fastening without requiring complex integrated protrusion shapes.
2Device complexity
If only fastening members (bolts and nuts) are used to connect the cab riser to the main body, then the structure is simple, but the fastening members may be broken by shearing forces during lateral sliding
Solution Approach 1:
The positioning guide structure is designed to preemptively prevent lateral sliding between the cab riser and main body before fastening members are fully engaged. By providing guided positioning surfaces that constrain lateral movement, the structure prevents harmful shearing forces from developing on the fastening members during the connection process.
Solution Approach 2:
The positioning guide structure performs the preliminary action of aligning and stabilizing the cab riser in the correct position before the fastening members are installed. This preliminary positioning action ensures that when fastening members are installed, the components are already properly aligned, eliminating lateral forces that would cause shearing.
3Adaptability or versatility
If the cab riser is designed to tilt forward and backward between transportation and operation positions, then transportation compliance and operational visibility are improved, but accurate positioning during transition becomes more difficult
Solution Approach 1:
The positioning guide structure provides localized positioning features at the specific interface between the cab riser and main body. These localized guides ensure accurate positioning at the critical connection point while allowing the rest of the cab riser to freely assume different positions (tilted forward for transportation, upright for operation).
Data Source
AI summary
A work machine comprising a main body and a cab riser. The cab riser includes a cab and a frame comprising a first plate to contact a second plate provided on the main body in a first position which the cab is uprightly positioned on the work machine. The first and the second plate are coupled together to sandwich a key plate in the first position, the key plate being disposed in a space created by a first recess on a lower surface of the first plate and a second recess on an upper surface of the second plate, the second recess being aligned with the first recess vertically in the first position, and the key plate includes a first contact surface as a slope surface and a top surface being adjacent to the slope surface in the cross sectional view of the key plate.