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Analys av vaxlingssystem,fran knopp till vaxellada
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Since cable shifting is a new sector for Scania, they want to have methods for analysis

and evaluation of such a system, but also possibilities of making comparisons

between dierent gear shifting devices regardless of the type of system. For that purpose

several measures and plots been have developed in order to work as tools for

evaluation and comparison of gear shift devices. The more important among those

are:meanboxplotslength, Tp-play, system rigidity, and wire buckling degree if a cable

shifting device is to be analyzed.

The report explains how to proceed when doing an analysis with FEM, but also

with rough estimations using simple formulas for calculations of the backlash in the

cable and the eciency. Input to those formulae are the total bending angle, the

friction coecient and the play between the core and the liner. Three dierent gear

shift devices have been investigated with those methods whereas two where with

cable and one was a linkage. Analysis indicates that the amount of increased play

in the system due to wear is about 36 %.

One diculty with transporting push loads in cables is that the core buckles

inside the liner at straight parts. The wire buckling degree has been developed in

order make comparison between dierent cable layings. Therefor is it recommended

to avoid straight parties in order to keep the buckling at a low level.

Regarding the gear shift housing for the cable - a design proposal has been made

that propose that a push force on the lever should give a push force in the cable.

Place, publisher, year, edition, pages
2014. , 48 p.
TRITA-AVE, ISSN 1651-7660 ; 2014:24
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-159874OAI: diva2:787494
Available from: 2015-02-10 Created: 2015-02-10 Last updated: 2015-02-10Bibliographically approved

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