Straddle-type monorail car body underframe structure

CN117565912BActive Publication Date: 2026-06-19CRRC NANJING PUZHEN CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CRRC NANJING PUZHEN CO LTD
Filing Date
2023-11-15
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

The existing straddle-type monorail train chassis structure has a large number of welds, high density, and large welding deformation, making it difficult to meet the requirements of high manufacturing precision and simple process. In addition, the use of carbon steel structure results in heavy weight.

Method used

The underframe structure is constructed by welding hollow large aluminum alloy extruded profiles, including components such as the front beam, driver's cab side beam, and front inner end beam. These components are welded together to form a lightweight underframe skeleton, and W-shaped reinforcement structures and reinforcing corners are installed in key areas to simplify the manufacturing process.

Benefits of technology

It achieves lightweight design, simplifies manufacturing process, improves structural strength and stiffness, facilitates low floor structure, meets strength requirements for longitudinal, vertical and torsional loads, and reduces weight and welding difficulty.

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Abstract

This invention discloses a straddle-type monorail car body underframe structure, including a underframe skeleton and a floor disposed on the upper end of the underframe skeleton. The underframe skeleton is assembled and welded from hollow large aluminum alloy extruded profiles. The underframe skeleton includes a front beam, a driver's cab side beam, a front inner end beam, a driver's cab end bolster beam assembly, a underframe side beam, a second-position end bolster beam assembly, and a rear beam. The front beam, driver's cab side beam, front inner end beam, driver's cab end bolster beam assembly, underframe side beam, second-position end bolster beam assembly, and rear beam are fixed together by welding. This invention has a simple structure and reasonable design. It is assembled and welded from hollow large aluminum alloy extruded profiles, resulting in less welding, a lightweight design, easy modularization, convenient manufacturing process, simple on-site operation, easy avoidance of bogie and tire areas, simple structure, high space utilization, and the ability to achieve a low-floor structure design, thereby improving the structural strength and rigidity of the car body underframe.
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