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PACE Collaborative Project: Emerging Market Vehicle
Transmission DesignTeam member:
Anthony Smith Kevin Scott
Decorian HarrisJacque Thornton
Advisor: Dr. Xiaobo Peng
Department of Mechanical Engineering
Prairie View A&M University, Prairie View, Texas
Outline
Project Goal and ObjectivesProject PlanningDetailed System DesignResultsConclusion and Recommendations
Goals and Objectives
Suitable for an emerging market
Inexpensive to produce High fatigue safety
factor High strength capacity
Ability to handle high torque and horsepower
Lightweight Allowance for ample
clearance Should operate under
extreme conditions
GOAL: To develop an efficient transmission/gearbox design to suit the needs of the emerging market vehicle.
Constraints on Transmission
Length: 300 mm maximum Width: 350 mm maximum Height: 300 mm maximum Weight according to total weight of vehicle.
Project Management: Gantt Chart
Gear Train: Calculation Equations
Minimum Number of Teeth
Npa = 2 · k
( 1 + 2 · m ) · sin 2 ( ) · ( m + ( m 2 + ( 1 + 2 · m ) · sin 2 ( ) )
0.5)
Gear Diameter Number of Revolution Safety Factor
da = Na
p2wb =
Npa
Npb · wa n cawear =
Sca · ZN
cawear
Torque Velocity Transmitted Load
Ta = H
wa · 550 · 0.5 · 60 Vabin =
· da · wa
12Wtabin = 33000 ·
H
Vabin
Design Calculations
Using a creditable machine design textbook, calculation for tooth number, safety factors, bending, wear, and stress were done.
7
Tooth Number Minimum [Teeth]
Tooth Number Used [Teeth]
Diameter of Gear [ in]
Revolution of Gears [Rev / min]
Safety Factors Gear Ratio Used
Gear 2Gears for 1st
Gear
14 28 4 3000 1.7131.5
Gear 3 21 42 6 2000 1.421
Gear 4Gears for 2nd
Gear
14 31 4.429 3000 1.8171.258
Gear 5 17 39 5.571 2385 1.634
Gear 6Gears for 3rd
Gear
13 32 4.571 3000 1.851.88
Gear 7 15 38 5.429 2526 1.707
Gear 8Gears for Reverse
15 15 2.143 3000 1.1342.067
Gear 9 29 30 4.286 1500 0.8921
Gear 10Gears for 4th
Gear
13 35 5 3000 1.9421
Gear 11 12 35 5 3000 1.942
Gear Design & FEA Analysis
Shaft Design
Reverse shaft
Input shaft
Output shaft
Housing
Bottom housing
Upper housing
Other Major Components
Synchronizer
Reverse engager shaft
Slider for synchronizer Synchronizer engager
Other Major Components
Bearing gasket
Engager shaft
Bearing
Transmission Assembly
Transmission Assembly
Results
Design is created to fit constraints.Design was verified by FEA. It is a safe transmission design.
Conclusion & Recommendations
Developed a successful design Better communication between Universities
involved Obtaining up to date software