Bumper Lift Assist Design

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Date
2017-12-06
Authors
Mahon, Mark
Reimer, Michael
Wang, Shuai
Xin, Zitian
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Abstract
The following document outlines Team 6’s final design proposal for MECH 4860, Engineering Design, Fall 2017. The objective of this reportisto provide a detailed design for a lift assist mechanism to aid in raising and lowering S&V Manufacturing’s line of Bison Grille Guard products. S&V Manufacturing is a Winnipeg based company that designs, manufactures, and distributes high strength grilleguards for semi-trucks, pickup-trucks, and SUVs. The grille guard’s purpose is to protect the vehicle and its passengers in the event of a collisionwith wildlife. The grille guards accomplishthis by having high strength aluminum designs, which in turn, makes them heavy and cumbersome for the operators to raise and lower. The design of a grille guardlift assist mechanism is critical to ensure the safety of the vehicle operates and allow forS&V Manufacturingto remain competitive in the marketplace.Theteams proposed lift assist mechanism is an assembly containing 16 components, including two custom manufactured 1.35 [Nm/o] torsional springs. The addition of the torsional springs promiseto reduce the grille guards weight by up to 75.21[%], whileonly requiringa maximum force of 14.33[lbf] to raise the grille guard fromthe lowered position. This proposed lift assist design has an estimated unit cost of $632.92CAD which can be reduced to $349.02 CAD per unitwhen the number of units produced is increased to100. There is also tremendous potential to further reduce the unit cost of thelift assist design by increasing the productionquantity.The latch design proposed by the team is a modification of the tow pin design currently being usedby S&V Manufacturing. This advanced tow pin design consists of fiveseparate components which includemultiple keys and key seats,allowingfor easy locking and unlocking of the grille guard. The proposed latch design has an estimated unit costof$0.00CADsince allrequired materials can be sourced fromS&V Manufacturing’sscrap material. All manufacturing procedures required to assemblethe latch mechanism are already in place at S&V Manufacturing.This design will reduce the time it takes to lock and unlock the grille guardas well as ensure the grille guard remains in its upright position during operation of the vehicle.
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