MAE461

Extra Credit Project

Fall 2003

Detailed Design of Transmission Shaft

Due date: Friday, December 5, 2003

Draft: November 20, 2003

1

Objectives

The objective of this project is to develop detailed drawings for the two shaft stubs and intervening tube of a trans-
mission shaft. An assembly drawing of the shaft with gear and sprocket fitted appears at the end of this assignment.
Detail drawings of the gear, sprocket, and the two bearings are also provided. For the purposes of the assignment, you
may assume that the shaft operates at 1008 RPM and is intended to transmit 177 horsepower.

2

Grading

This assignment is worth a maximum of 10 points, which will be added to your class score (out of 100) after the class
has been curved. Your actual grade will depend on how complete the resulting detail drawings are and how well you
support your choice of each dimension. Fifty percent of the grade will be based on the drawings and fifty percent on
the supporting arguments.

3

Requirements

Your completed assignment must include the following four items:

1. a detail drawing of the shaft tube, with all dimensions and tolerances indicated.

2. a detail drawing of the sprocket end stub, with all dimensions and tolerances indicated.

3. a detail drawing of the gear end stub, with all dimensions and tolerances indicated.

4. a separate document explaining the rationale behind every dimension and tolerance that you select.

The completed design must conform to the following specifications:

1. transmitted power = 177 horsepower

2. distance between gear and sprocket centerlines = 36 inches

3. gear, sprocket, and associated bearings are removable

4. gear and sprocket are indexed to the shaft stubs using keys and keyways

5. keys and keyways must be compatible with the 177 HP requirement

1

5

4

3

2

1

item

qty

1
1
1
1
1

key, sprocket

double row angular contact ball bearing

roller bearing, 312 series

gear

sprocket

description

6

1

key, gear

7

1

shaft stub, sprocket

8

1

shaft stub, gear

item

qty

description

9

1

shaft tube

10

1

bearing spacer, sprocket

11

1

bearing spacer, gear

12

2

nut, 1-8 UNC

13

1

washer, sprocket

14

2

lockwasher, keyed

15

1

washer, gear

1

2

6

5

7

8

9

Department of Mechanical and Aerospace Engineering

University of Virginia

Charlottesville, Virginia 22904-4746

Transmission Shaft Ass’y

SIZE

FSCM NO

DWG NO

REV

A

R200A000

A

SCALE

1:4

SHEET

1 OF 1

D

C

B

A

4

3

2

1

D

C

B

A

4

3

2

1

10

3

13

14

12

14

12

15

11

4

D

C

B

A

4

3

2

1

D

C

B

A

4

3

2

1

Tolerances, except where otherwise noted:

x.xxx: +/- 0.002
x.xx: +/- 0.010

Department of Mechanical and Aerospace Engineering

University of Virginia

Charlottesville, VA 22904-4746

Sprocket

SIZE

FSCM NO

DWG NO

REV

R200A001

SCALE

1:2

SHEET

1 OF 1

ANSI #80 Chain Sprocket x 25 teeth x 4 rows

Ø 2.5502 +/- 0.0002

3.302

REF

4.034

REF

D

C

B

A

4

3

2

1

D

C

B

A

4

3

2

1

standard involute gear
pitch = 0.4833
pressure angle = 20 deg
number of teeth = 46

1.786

Ø 2.4890

Tolerances, except where otherwise noted:

x.xxxx: +/- 0.0002
x.xxx: +/- 0.002
x.xx: +/- 0.010

all dimensions are in inches unless

otherwise noted

Department of Mechanical and Aerospace Engineering

University of Virginia

Charlottesville, VA 22904-4746

Gear

SIZE

FSCM NO

DWG NO

REV

R200A002

SCALE

1:2

SHEET

1 OF 1

D

C

B

A

4

3

2

1

D

C

B

A

4

3

2

1

Tolerances, except where otherwise noted:

x.xxxx: +/- 0.0002
x.xxx: +/- 0.002
x.xx: +/- 0.010

all dimensions are in inches unless

otherwise noted

Department of Mechanical and Aerospace Engineering

University of Virginia

Charlottesville, VA 22904-4746

Roller Bearing, 312 series

SIZE

FSCM NO

DWG NO

REV

R200A003

SCALE

1:2

SHEET

1 OF 1

Ø 2.3557

REF

Ø 5.1250

REF

1.2188

REF

D

C

B

A

4

3

2

1

D

C

B

A

4

3

2

1

Tolerances, except where otherwise noted:

x.xxxx: +/- 0.0002
x.xxx: +/- 0.002
x.xx: +/- 0.010

all dimensions are in inches unless

otherwise noted

Department of Mechanical and Aerospace Engineering

University of Virginia

Charlottesville, VA 22904-4746

Double Row Angular Contact Ball Bearing

SIZE

FSCM NO

DWG NO

REV

R200A004

SCALE

1:2

SHEET

1 OF 1

Ø 2.0000

REF

Ø 4.6875

REF

1.5938

REF