Snap Ring Joint Design for Transmissions at Volvo Cars
Date
Authors
Type
Examensarbete för masterexamen
Programme
Model builders
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Volume Title
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Abstract
While the Volvo Car Corporation’s mission is to develop cars which will fulfill the
customers expectations, the ergonomics of the technicians and mechanics is also
taken into account. This study was carried out to optimize the design of the interface
between the front left driveshaft and the gearbox differential to make it possible to
assembly and disassemble with a snap fit. The study considers previous analytical
studies in split rings as well as mathematical models in order to try to comprehend
the forces acting on it during assembly and disassembly. Some parameters were
tested in the workshop and later on in the Universal Testing Machine to obtain data
from several different experiments. After having understood the model and having
data to compare, a Finite Element Method was developed to be able to test further
parameters. Once the model reassembled the tests previously carried out, a Design
of Experiments was carried out using a response surface tool. Using this tool, the
parameters which affect more the assembly and disassembly forces were identified.
Results from the modeling don’t quite resemble the reality as the interface is very
sensitive for contact and geometric imperfections but serve as a base to understand
the most influential parameters. Finally, a new design was proposed based on all
the previous experiments. Further recommendations for this topic are also given for
alternative designs and what to avoid when designing a new ring.
Description
Keywords
Snap ring; disassembly force; splined interface; driveshaft; snap design;, ANSA; Contact modelling; Volvo Car Corporation; Differential gear; Retaining ring