Hydraulic Pump Design for Coupe Door System

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Hydraulic Pump Design for Coupe Door System
Michigan State University

• Modeling of the Hydraulic Pump Concept
• PISTON
• ? Piston heads Travels 132.7mm
• from fully open to fully closed
• ? Piston Stem is fixed to vehicle interior
• ? Provides the Driving Force of the Fluid
• Flow due to an Applied Input Force
• ? Ball bearings permit relatively smooth
• travel of the piston within the cylinder
• ? The relative movement of the piston head
  resembles the direction of door motion.
  Compressive Motion corresponds to a door closing
  direction and Tensional Motion corresponds to a
  door opening direction.
• CYLINDER
• ? Length is 150mm, Diameter is 40mm
• ? Grounded to inner portion of the door
• ? Piston Head is positioned and is
• translated axially within cylinder.
• ? Regulates the distance of Piston travel
• HYDRAULIC FLUID
• ? Dot 3 Breaking Fluid
• ? Relatively high boiling point

Assembled Hydraulic Pump design

• Group Member Faculty Advisor
• Chris Lowe Dr. Farhang Pourboghrat
• Jeff Mann
• Fai Leung
• Doo-hwan Kim
• Sponsor (GM)
• James Karlavage
• Problem Statement
• To develop a working concept for a side closures
  system hold open device, capable of infinite
  adjustment.
• In essence, the objective is to create a
  universal door opener that will allow a car door
  to stay in whatever position the customer opens
  it to and then release when pushed/pulled closed
• The housing must not exceed 80mm X 40mm
• The mechanism should be capable of applying
  approximately 40Nm of hold open torque to hold
  the door open

Alternative Hydraulic Pump design
Results
Fluid Leakage Problems are Plausible Most likely
would occur at the mating and bonding
sections Issue Decreases the efficiency and
proficiency Solution Add O-ring seals and
silicone sealants to affected areas Infinite
Stop Positions Between Fully Open and Fully
Close Equivalent Fluid Pressure on both sides of
the Piston Head when applied force is
ceased. More Force needed to Open than to
Close Using a one-way pressure reducing valve
for the closing compressive direction with a
greater diameter than the one-way valve for the
opening tensional direction should resolve this
issue due to the Theory of Least Resistance.
Conclusion It would be the best idea to
implement the alternative hydraulic pump design
because it is just as efficient as the original
pump design and it better fits within the special
constraints of the current GM vehicle models.
Although the price of implementing the
alternative design seems steep (at 10M the first
year and 5M for the years after), these types of
prices are minuscule to a prosperous company like
GM. Implementing such a concept that allows
infinite door positions while applying
insignificant force increases customer
satisfaction and decreases door opening related
accidents. Thus, overall, this will attract more
customers to purchase GM vehicles and in the
end, we believe that GM will make a huge profit
off sales in comparison to what they would pay to
manufacture the pump units.
Schematic of Current Door System (Top view)