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Bright Trim on Bodyside

Andersson, Jacob (2011) MMK920 20111
Product Development
Abstract
This report summarises the results of a thesis work performed at Lund University, Faculty of Engineering (LTH) in association with Volvo Car Corporation (VCC) in the autumn of 2010 through the winter of 2011. The task is to develop a system to mount a bright trim on a vehicles bodyside. A bright trim is a polished metal trim that is fitted around the windows of a vehicle for aesthetical reasons. The conventional method in VCC is to mount the bright trim on the doors and this generates a number of problems when it comes to variation.

Doors are movable parts that are mounted on the vehicle body with a hinge, thus the doors position has a relatively large variation. If the bright trim is mounted on the door it has an internal variation... (More)
This report summarises the results of a thesis work performed at Lund University, Faculty of Engineering (LTH) in association with Volvo Car Corporation (VCC) in the autumn of 2010 through the winter of 2011. The task is to develop a system to mount a bright trim on a vehicles bodyside. A bright trim is a polished metal trim that is fitted around the windows of a vehicle for aesthetical reasons. The conventional method in VCC is to mount the bright trim on the doors and this generates a number of problems when it comes to variation.

Doors are movable parts that are mounted on the vehicle body with a hinge, thus the doors position has a relatively large variation. If the bright trim is mounted on the door it has an internal variation relative to the door, this ads to the door variation and gives the system properties that are sensitive to variation. Because the bright trim on the front and rear door are lined up and the bright trim has a polished and eye-catching surface the variation is clearly visible.

To overcome these difficulties one solution is to mount the bright trim on the bodyside in one piece. This erases the splits in the bright trim and therefore the system is not as sensitive to the doors variation.

The prerequisites are mostly determined from interviews with employees in VCC and research based on the knowledge from the education at LTH.

After the research, concept generation began with the prerequisites in mind. The chosen concept was developed especially with shape and mounting method to fit the narrow section in the quarter glass area on VCC vehicles. The bright trim is mounted in Y-direction instead of Z-direction that is the method used by other car manufacturers using similar solutions.

To fasten the bright trim to the body, a method is used that has the advantage that it only takes up 2 mm on the inside of the cant rail. This gives the opportunity to design the reinforcements on the inside of the cant rail more freely. Principally, a plastic clip with bayonet clutch properties allows this, it is placed in a specially shaped hole and is then rotated 135°. Barbs keep the bright trim in place.

Another function of the bright trim than aesthetics is that it also functions as a drip moulding to prevent rainwater to run over the roof of the vehicle when the doors are open and contaminating the seats. In the bright trim a rubber moulding is fitted that leads the water away from the door openings.

The solution is verified with computer visualisations and simulations and physical tests. (Less)
Please use this url to cite or link to this publication:
author
Andersson, Jacob
supervisor
organization
course
MMK920 20111
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Automotive, car, exterior, trim, fastener
other publication id
ISRN LUTMDN/TMKT 10/5412 SE
language
English
id
3158772
date added to LUP
2013-01-07 08:24:04
date last changed
2013-01-07 08:24:04
@misc{3158772,
  abstract     = {This report summarises the results of a thesis work performed at Lund University, Faculty of Engineering (LTH) in association with Volvo Car Corporation (VCC) in the autumn of 2010 through the winter of 2011. The task is to develop a system to mount a bright trim on a vehicles bodyside. A bright trim is a polished metal trim that is fitted around the windows of a vehicle for aesthetical reasons. The conventional method in VCC is to mount the bright trim on the doors and this generates a number of problems when it comes to variation.

Doors are movable parts that are mounted on the vehicle body with a hinge, thus the doors position has a relatively large variation. If the bright trim is mounted on the door it has an internal variation relative to the door, this ads to the door variation and gives the system properties that are sensitive to variation. Because the bright trim on the front and rear door are lined up and the bright trim has a polished and eye-catching surface the variation is clearly visible.

To overcome these difficulties one solution is to mount the bright trim on the bodyside in one piece. This erases the splits in the bright trim and therefore the system is not as sensitive to the doors variation.

The prerequisites are mostly determined from interviews with employees in VCC and research based on the knowledge from the education at LTH.

After the research, concept generation began with the prerequisites in mind. The chosen concept was developed especially with shape and mounting method to fit the narrow section in the quarter glass area on VCC vehicles. The bright trim is mounted in Y-direction instead of Z-direction that is the method used by other car manufacturers using similar solutions.

To fasten the bright trim to the body, a method is used that has the advantage that it only takes up 2 mm on the inside of the cant rail. This gives the opportunity to design the reinforcements on the inside of the cant rail more freely. Principally, a plastic clip with bayonet clutch properties allows this, it is placed in a specially shaped hole and is then rotated 135°. Barbs keep the bright trim in place.

Another function of the bright trim than aesthetics is that it also functions as a drip moulding to prevent rainwater to run over the roof of the vehicle when the doors are open and contaminating the seats. In the bright trim a rubber moulding is fitted that leads the water away from the door openings.

The solution is verified with computer visualisations and simulations and physical tests.},
  author       = {Andersson, Jacob},
  keyword      = {Automotive,car,exterior,trim,fastener},
  language     = {eng},
  note         = {Student Paper},
  title        = {Bright Trim on Bodyside},
  year         = {2011},
}