Dump Truck Frame Vertical Side Members Load Path
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Solution Overview
Problem
Existing dump truck designs experience bending moments in the vehicle body frame due to body load transmission, leading to structural complexity and reduced durability, as the load is transmitted away from the tire rotation axis.
Innovation Solution
The design incorporates a vehicle body frame with first and second vertical frames positioned under the tires, featuring mount portions on their upper parts, allowing load transmission directly to the ground via the tires, thereby minimizing bending moments and simplifying the frame structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the body is supported by mount portions provided on the vehicle body frame at positions away from the tire rotation axis, then the body can be raised and lowered, but bending moments are generated on the vehicle body frame
Solution Approach 1:
The vehicle body frame is segmented into multiple components: a front frame, a rear frame, and side frames connecting them. The mount portions are specifically positioned on the side frames at locations aligned with the tire rotation axis. This segmentation allows the load transmission path to be optimized through the side frames directly to the tires, minimizing bending moments on the overall vehicle body frame while maintaining the body raising and lowering function.
2Strength
If the vehicle body frame is designed to endure bending moments, then strength is sufficient, but the structure becomes complicated
Solution Approach 1:
The function of withstanding bending moments is extracted from the overall vehicle body frame and assigned specifically to the side frames. The side frames are designed as rigid components that directly transmit vertical loads from the mount portions to the tires. By extracting this load-bearing function, the front and rear frames can be designed with simpler structures focused on their primary functions, thereby reducing overall structural complexity while maintaining sufficient strength.
3Ease of operation
If mount portions are positioned away from the tire rotation axis, then body support is provided, but load transmission creates bending moments
Solution Approach 1:
The mount portions are positioned in a specific dimensional relationship to the tire rotation axis - specifically, at locations where the vertical line from the mount portion intersects the tire rotation axis. This dimensional alignment creates a direct load transmission path in the vertical dimension from the body through the side frames to the tires, eliminating the horizontal offset that would generate bending moments. The side frames serve as the dimensional bridge maintaining this alignment.
Data Source
AI summary
A dump truck includes: a vehicle body frame; tires provided to the vehicle body frame and configured to travel the dump truck; and a body supported by the vehicle body frame and configured to be raised and lowered, in which the vehicle body frame includes: a first vertical frame vertically standing in a side view at positions of the tires provided to a first side of the vehicle body frame in a travel direction; and a second vertical frame vertically standing in a side view at positions of the tires provided to a second side of the vehicle body frame in the travel direction, and a mount portion on which the body is mounted is provided on an upper portion of each of the first vertical frame and the second vertical frame.