Dump Truck Rail Thickness Configuration for Stress Reduction
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Solution Overview
Problem
Conventional dump trucks face issues with rail deformation and potential breakage due to high bending stress at joints, leading to increased mass and reduced payload capacity when thicker plates are used to enhance rigidity, which negatively impacts fuel economy and tire life.
Innovation Solution
The dump truck design features a rail structure with side rail plates thinner than the bottom rail plate, which is thicker than the top frame plate, ensuring a Ts < Tb < Tf relationship, providing enhanced rigidity while minimizing mass increase and reducing stress at joints, thus preventing breakage and allowing for mass savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the bottom rail plate is increased to enhance rigidity and prevent breakage, then the strength and reliability are improved, but the mass of the body increases, leading to reduced payload capacity and worsened fuel economy
Solution Approach 1:
The patent applies different plate thicknesses to different parts of the rail structure. The bottom rail plate has a greater thickness (Tb) than the side rail plates (Ts) to specifically address the high bending stress at the center of the bottom rail plate, while avoiding unnecessary mass increase in other areas. This localized quality enhancement resolves the contradiction by providing strength exactly where needed without uniformly increasing overall mass.
Solution Approach 2:
The patent changes the thickness parameter of the bottom rail plate relative to the side rail plates, establishing a specific relationship (Tb > Ts) to optimize the strength-to-mass ratio. This parameter adjustment allows the structure to withstand high bending moments while controlling overall mass, directly addressing the contradiction between reliability and weight.
2Strength
If thicker plates are used throughout the rail structure to prevent breakage, then the strength is improved, but the payload capacity is reduced due to increased mass
Solution Approach 1:
Instead of uniformly thickening the entire rail structure, the patent applies increased thickness (Tb) specifically to the bottom rail plate where bending stress is highest, while keeping the side rail plates (Ts) thinner. This localized approach provides the necessary strength at critical locations without unnecessarily increasing overall mass, thereby preserving payload capacity while preventing breakage.
3Reliability
If the thickness of side rail plates is increased to reduce stress at joints, then the reliability is improved, but the mass increase leads to reduced fuel economy and shorter tire life
Solution Approach 1:
The patent recognizes that the highest stress occurs at the center of the bottom rail plate, not uniformly throughout the entire rail structure. By concentrating the increased thickness (Tb) in the bottom rail plate rather than increasing the thickness of side rail plates (Ts), the design provides joint strength exactly where needed while minimizing overall mass increase, thus preserving fuel economy and tire life.
Data Source
AI summary
A dump truck is provided with a frame, hinge pins and a body (5). The body is provided on a lower surface of a floor board (11a) thereof with a rail (12) along a longitudinal direction of the frame. The rail is a hollow structure member comprised of two side rail plates (12a) and a bottom rail plate (12b). The two side rail plates (12a) extend downwardly from the lower surface of the floor board (11a) of the body and oppose each other with an interval therebetween in a lateral direction of the frame, and the bottom rail plate (12b) is arranged in contact with respective lower end surfaces (12a-1) of these two side rail plates (12a). The dump truck (1) satisfies a relationship of Ts<Tb<Tf, where Ts is a thickness of the side rail plates, Tb is a thickness of the bottom rail plate, and Tf is a thickness of a top frame plate (2a-2) of the frame.