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