Utility Vehicle Bottom Main Frame with Intermediate Elevation
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Solution Overview
Problem
Utility vehicles often get stuck on uneven ground due to the vehicle body bottom contacting or being caught by obstacles between the front and rear wheels, which affects their traveling performance.
Innovation Solution
The vehicle body frame is designed with a bottom main frame that has a highest portion between the front and rear wheels, with a ground level increasing from the frame front and rear portions towards the highest portion, and includes a trailing arm configuration to prevent contact with obstacles, while maintaining a smooth drive shaft angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle body bottom is positioned at a higher ground level to prevent contact with obstacles, then traveling performance on uneven ground is improved, but the bend angle of drive shafts increases
Solution Approach 1:
The bottom main frame is designed with different ground levels at different locations: the front and rear portions are positioned at lower ground levels to maintain small drive shaft bend angles, while the intermediate portion is positioned at a higher ground level to prevent obstacle contact. This local differentiation resolves the contradiction by optimizing each section for its specific function.
2Object-affected harmful factors
If the bottom main frame is positioned at a high ground level to inhibit obstacle contact, then interference with obstacles is reduced, but the drive shaft bend angle increases
Solution Approach 1:
The bottom main frame employs localized height variation where only the intermediate portion is elevated to prevent obstacle contact, while the front and rear portions remain at lower levels to maintain acceptable drive shaft bend angles. This selective positioning resolves the contradiction between obstacle prevention and drive shaft geometry.
3Productivity
If the frame intermediate portion is elevated to prevent obstacle contact, then traveling performance is improved, but the ground level difference increases drive shaft bend angle
Solution Approach 1:
The bottom main frame is designed with the intermediate portion elevated at a controlled height (1-2 inches) above the front and rear portions. This localized elevation improves traveling performance by preventing obstacle contact while limiting the height difference to maintain acceptable drive shaft bend angles.
4Object-affected harmful factors
If the bottom main frame has a high ground level at the intermediate portion, then contact with obstacles is prevented, but the bottom main frame projects excessively upward
Solution Approach 1:
The ground level of the intermediate portion is optimized to be elevated by 1-2 inches above the front and rear portions. This parameter optimization prevents excessive upward projection while maintaining sufficient height to prevent obstacle contact, resolving the contradiction between obstacle prevention and overall frame profile.
Data Source
AI summary
A utility vehicle includes a vehicle body frame, a pair of right and left front wheels and a pair of right and left rear wheels. The vehicle body frame has, at a bottom thereof, a bottom main frame extending in an anteroposterior direction and provided with a frame front portion located between the front wheels, a frame rear portion located between the rear wheels, and a frame intermediate portion located between the frame front portion and the frame rear portion and extending in the anteroposterior direction. In a vehicle side view, the bottom main frame has a frame highest portion in the frame intermediate portion, which has a highest ground level in the bottom main frame, and the bottom main frame has a ground level gradually increasing from the frame front portion and the frame rear portion toward the frame highest portion.