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Utformningen av ett förstärkt skruvförband på en differentialväxel i bandvagnen BvS10: Analys av olika förband med hjälp av CATIA och MATLAB
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2015 (Swedish)Independent thesis Basic level (professional degree), 180 HE creditsStudent thesisAlternative title
The design of reinforced bolts to a differential gear in the tracked vehicle BvS10 : Analysis of different types of jointing with the help of CATIA and MATLAB (Swedish)
Abstract [en]

This is a thesis presents a differential gear which is found in a tracked vehicle called BvS10. The tracked vehicle is manufactured by BAE Systems Hägglunds AB in Örnsköldsvik, Sweden. The differential gear has a bolted house. The differential meets the requirement specifications, but the problem is that the bolts are sheared off because of the extreme torque that the differential is exposed to resist.

Previous report on the differential show pictures of bolts which have been sheared off at the threads. This report is also includes three lists that explain seven different proposals which some are approved and some are not, and the report also presents the force, tensile, and shear stress.

In a bolted connection there is both axial tension stress and radial shear stress, which can lead to wear out and broken bolts. To solve the problem, better bolts are need for the differential gear housing halves. The bolts are from M8 to M10 and all bolts are not directly compatible, so geometric modifications might have to be done. This reports proposes several solutions to this complex problem and also analyzes the proposed solutions.

The report also describes various theories from a technical and a historical point of view. Two flow charts have been created to show the work towards the presented solution. Although the analysis to welded joints and wedge joints have been included in the proposed solution.

The report propose a tight-fit bolt with a tolerance specially made for the differential gear, so the shear stress occurs at the non-threaded part of the bolt. The tight-fitted bolt is recommended to be M8 12.9 UNB because of it’s safety factor. Larger bolts may not directly fit in the differential housing halves due to there is no enough material.

Place, publisher, year, edition, pages
2015. , 104 p.
, MA, 1437
Keyword [en]
Bolted joints, Sweden, Technology, Mechanical Engineering
Keyword [sv]
Skruvförband, Sverige, Teknik, Maskinteknik
National Category
Mechanical Engineering
URN: urn:nbn:se:umu:diva-104626OAI: diva2:820733
External cooperation
BAE Systems Hägglunds AB
Subject / course
Educational program
Bachelor of Science Engineering in Mechanical Engineering
Available from: 2015-06-15 Created: 2015-06-12 Last updated: 2015-06-15Bibliographically approved

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Mårtensson, Daniel
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Department of Applied Physics and Electronics
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