Off-Road Vehicle Belt Retractor Mounting on Cross Tube
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Solution Overview
Problem
The installation of the belt retractor on the ROPS in existing side-by-side vehicles (SSVs) leads to significant stability issues and safety risks due to the ROPS deforming during roll-over events, compromising the connection strength and leading to potential seat belt and belt retractor failure.
Innovation Solution
The belt retractor is relocated from the ROPS to the frame, specifically connected to a cross tube that extends laterally across the vehicle, with optimized ratios of cross tube and side post heights to ensure effective safety protection and improved connection strength between the frame and ROPS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the belt retractor is installed on the ROPS, then the installation location is convenient and accessible, but the connection strength is insufficient and the structure deforms during roll-over events
Solution Approach 1:
The belt retractor is extracted from the ROPS structure and relocated to the frame structure. This separation removes the belt retractor from the deforming ROPS area and attaches it to the more stable frame, resolving the contradiction between accessibility and connection strength.
Solution Approach 2:
The frame structure serves as an intermediary between the ROPS and the belt retractor. By positioning the belt retractor on the frame rather than directly on the ROPS, the frame acts as a stable mounting platform that maintains connection strength while still allowing proper belt retraction functionality.
2Area of stationary object
If the ROPS is positioned close to the frame, then the protective coverage is maximized, but the connection strength between frame and ROPS is insufficient to handle roll-over forces
Solution Approach 1:
The connection between the frame and ROPS uses composite construction with gusset plates and multiple fastening points. This composite approach combines the frame structure with reinforced connection elements to create a joint that can handle roll-over forces while maintaining close positioning for optimal protective coverage.
Solution Approach 2:
The connection structure is segmented into multiple reinforcement zones including gusset plates at critical junctions and distributed fastening points. This segmentation allows the connection to distribute roll-over forces across multiple locations rather than concentrating stress at single points, enabling close positioning while maintaining strength.
3Ease of operation
If the cross tube is positioned higher, then the belt retractor installation is easier and more accessible, but the seat belt effectiveness may be compromised
Solution Approach 1:
The height position of the cross tube and belt retractor is optimized within a specific range rather than maximizing height. This parameter optimization ensures the belt retractor remains accessible for installation and operation while maintaining the geometric relationship necessary for effective seat belt anchorage and proper belt routing angles.
Data Source
AI summary
An off-road vehicle includes a frame, a roll-over protection structure, a suspension, wheels and a payload area. The frame and the roll-over protection structure cooperatively define a cockpit area. The frame includes a plurality of side posts arranged at the two sides of the cockpit area, and a cross tube. The payload area may include front-row seats and rear-row seats or may include front-row seats and a cargo box. The off-road vehicle further includes a seat belt and a belt retractor for both a driver seat and a passenger seat, and the belt retractors are at least partially arranged on the cross tube.