Dump Truck Step Arrangement Design for Approach Angle
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Solution Overview
Problem
Large-sized rigid dump trucks face challenges with steep step arrangements that violate ease-of-ascend/descend regulations, leading to reduced approach angles and increased turning radii, and are prone to damage from obstacles during vehicle sinking.
Innovation Solution
A step arrangement design featuring an upper step that leads downward and forward, with a lower step that slopes inward from the outer side to the inner side, reducing inclination and projecting less from the vehicle body, and incorporating a step inclined portion to maintain a favorable approach angle and turning radius while preventing damage from obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a steep step arrangement is used to meet ease of ascent/descent regulations, then the inclination angle of the step arrangement is reduced, but the lower portion of the step arrangement projects forward from the vehicle body, reducing the approach angle and increasing the turning radius
Solution Approach 1:
The lower step is designed to slope from the outer side toward the inner side of the vehicle body, changing the traditional straight vertical step arrangement into a multi-dimensional configuration. This allows the step to provide easier ascent/descent while controlling the forward projection distance, thus maintaining favorable approach angle and turning radius.
2Reliability
If the lateral side of the vehicle body is sunk because of rolling of the vehicle body, then the lower portion of the step arrangement located at the lateral side is likely to bump against rocks on a road shoulder or the like to be damaged
Solution Approach 1:
The lower step is designed with a slope from outer side to inner side, which preliminarily positions the outer corner of the lower step higher than it would be in a traditional vertical step arrangement. This preliminary positioning prevents the step from bumping against rocks or obstacles when the vehicle body sinks due to rolling, thus preventing damage before it occurs.
Data Source
AI summary
A step arrangement of a dump truck includes a third step that leads down in an up-and-down direction of a vehicle body while being gradually directed forward, and a second step that is provided to a lower end of the third step and leads down in the up-and-down direction while being gradually directed from an outer side toward an inner side of the vehicle body. The height of an outer lower portion of the second step is higher than the height of an inner lower portion thereof.