Tailgate Linkage for Power Machine Frame Access
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Solution Overview
Problem
Existing power machines, such as excavators and loaders, face challenges in securely mounting and opening tailgates without them swinging wider than the machine's frame, which can obstruct access to internal components.
Innovation Solution
A connection system utilizing a four-bar linkage and a connecting rod to pivotally mount the tailgate, allowing it to move between closed and open positions while being drawn inward as it opens, ensuring it remains within the frame's lateral boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional hinged tailgate is used that rotates about a vertical axis, then the tailgate can be opened for access to components, but the tailgate swings wider than the frame and obstructions access to internal components
Solution Approach 1:
The patent applies a four-bar linkage mechanism that dynamically controls the tailgate's movement path. Unlike a simple hinge that allows free rotation, the four-bar linkage (comprising first link, second link, third link, and fourth link connected through pivotal joints) dynamically constrains the tailgate to follow a specific arcuate trajectory, ensuring it remains within the frame's lateral boundaries while still achieving full opening capability for component access.
Solution Approach 2:
The connecting rod serves as an intermediary element between the tailgate and the frame. It transmits and controls the motion of the tailgate, mediating between the opening action and the frame's lateral boundaries. The connecting rod, in conjunction with the four-bar linkage, ensures the tailgate moves along the desired path without exceeding the frame dimensions.
2Object-affected harmful factors
If a four-bar linkage with connecting rod is used to constrain tailgate movement, then the tailgate remains within frame boundaries, but the mounting structure becomes more complex
Solution Approach 1:
The mounting structure is segmented into distinct functional components: first attachment structure, second attachment structure, first link, second link, third link, fourth link, and connecting rod. Each segment performs a specific function within the four-bar linkage system, allowing for modular design, easier manufacturing, and simplified assembly while achieving the complex constraint function.
Solution Approach 2:
The four-bar linkage employs pivotal joints at each connection point, allowing the structure to be dynamic rather than rigid. This enables the tailgate to move through its required arcuate path while maintaining constraint within frame boundaries. The dynamic nature of the linkage allows it to adapt to the tailgate's movement without requiring overly complex fixed constraints.
Data Source
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AI summary
An attachment system for attaching a tailgate (312) to a frame (110; 210) of a power machine (100; 200). The tailgate is moveable between a closed position and an opened position. The attachment system includes first and second attachment structures (324; 326) for pivotally mounting the cover to the frame. The second attachment structure is spaced apart from the first attachment structure. A connection member (322) connects the first attachment structure and the second attachment structure. The tailgate is configured to pivot about the connection member as it moves between the closed position and the open position.