Rotatable Tailgate Assembly for Dump Bed Closure
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Solution Overview
Problem
Large off-road trucks used in construction and mining lack a reliable and maintainable closure mechanism for their open dump beds, limiting load capacity and posing reliability and maintainability issues with existing revolving closure solutions.
Innovation Solution
A rotatable tailgate assembly that rotates downward and can be parked underneath the dump bed, combined with a dump bed extension module to increase usable volume, utilizing a cylindrical tailgate shaft and rotation actuator to achieve secure closure and efficient rotation through a chain drive mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a closure mechanism is provided to increase usable dump bed volume, then load capacity is improved, but reliability and maintainability deteriorate due to complex revolving mechanisms
Solution Approach 1:
Instead of revolving the entire closure upward as in conventional designs, this invention inverts the approach by having the closure rotate downward to a stowed position underneath the dump bed. The closure rotates about a horizontal axis from a closed position to a stowed position beneath the bed, eliminating the need for complex upward revolving mechanisms and improving reliability and maintainability.
2Ease of operation
If the entire closure revolves upward to close the dump bed, then closure function is achieved, but device complexity and maintainability worsen
Solution Approach 1:
The closure mechanism is segmented into a closure portion and a stowage portion. The closure portion performs the closing function while the stowage portion provides a compact storage location underneath the dump bed. This segmentation allows the closure to rotate downward to a stowed position, simplifying the overall mechanism compared to conventional upward revolving designs.
Solution Approach 2:
The closure rotates about a horizontal axis rather than revolving upward in a vertical plane. This dimensional change in the rotation axis allows the closure to sweep downward and stow underneath the dump bed, creating a simpler mechanism with fewer moving parts and improved maintainability.
3Productivity
If a tailgate closure is added to increase load capacity, then productivity is improved, but ease of operation deteriorates due to limited access for maintenance
Solution Approach 1:
By inverting the rotation direction to downward motion, the closure stows underneath the dump bed rather than positioning above it. This inversion dramatically improves maintenance accessibility, as technicians can easily reach the closure mechanism from below the bed without requiring complex disassembly or working at elevated positions.
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
The solution provides a secure closure for the dump bed while allowing for increased load capacity and improved maintainability by enabling the tailgate to be rotated and stowed beneath the bed, overcoming the reliability and maintainability issues of existing systems.
Implementation Method 1
utilizing a cylindrical tailgate shaft and rotation actuator to achieve secure closure and efficient rotation through a chain drive mechanism
Data Source
AI summary
A rotatable tailgate assembly is provided for installation on a dump bed. The tailgate assembly has support members attachable to the side of the dump bed. Each support member has at least one bearing adjacent at a free end extending rearwardly of the dump bed's rear opening. A tailgate has a cylindrical tailgate shaft with a first end rotatably received within the bearing of a first support member and a second end rotatably received within a bearing of a second support member. The tailgate has a closure portion extending radially away from the tailgate shaft. The closure portion engages the rear edges of the dump bed floor and sides to close off the dump bed opening when the tailgate assembly is in a closed rotational position. The tailgate assembly also comprises a rotation actuator operatively connected to the tailgate shaft for selective rotation thereof.