10-11 gears-all - ME250 Design and Manufacturing I Gears...

Info iconThis preview shows pages 1–25. Sign up to view the full content.

View Full Document Right Arrow Icon
Gears ME250 Design and Manufacturing I
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 What? Why? Type of gears Gear basics Gear trains Force analysis Gear manufacturing Summary Outline
Background image of page 2
3 A machine element that transmits rotational and linear motion through meshed teeth What?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 What?
Background image of page 4
5 What?
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 What?
Background image of page 6
7 Can change direction, speed, location, and type of motion Why?
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 Can reduce rotational speed and increase torque (or vise versa) Highly efficient: input power ≈ output power Why? input output TT    
Background image of page 8
9 Type of gears Spur Gears Parallel axes Opposite direction of rotation
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
10 Bevel Gears Non-parallel, intersecting axes Type of gears
Background image of page 10
11 Helical Gears Parallel axes Less wear and noise Type of gears http://www.youtube.com/watch?v=q6911vCe-pA
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
12 Worms and Worm Gears Orthogonal, non-intersecting axes Very high reduction ratio with a small size Input from worm only Type of gears http://www.youtube.com/watch?v=TA7N-tNcFdU
Background image of page 12
13 Rack and Pinion Rotational to linear (or vise versa) Hypoid gears Non-parallel, non-intersecting Type of gears
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
14 Gear trains Can achieve greater speed reduction (or torque increase) Can achieve greater change in location of motion Type of gears
Background image of page 14
15 Automotive manual transmission Can switch one gear combination to another to achieve different speed reduction Type of gears http://www.youtube.com/watch?v=MBmLJCeGu7o
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
16 Torque speed curve of typical IC engine Type of gears
Background image of page 16
17 Micro gear train Type of gears
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
18 Planetary gear trains Type of gears http://www.youtube.com/watch?v=rIkroVwOxOs
Background image of page 18
19 Parallel gas-electric hybrid powertrain Type of gears
Background image of page 19

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
20 Differential gear train Type of gears
Background image of page 20
21 Differential gear train Allow left and right wheels to rotate in different speeds Split torque from driveshaft to left and right wheels inversely proportional to their speeds Type of gears http://www.youtube.com/watch?v=FKaF20iFU9s
Background image of page 21

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
22 Nomenclature Larger gear = “gear”; smaller gear = “pinion” d 1 , d 2 = pitch diameters Pitch diameters depend on gear spacing, not gear geometry Gear speed ratio (note the sense) Gear reduction ratio Gear basics ω 1 ω 1 d 1 d 2 ( d 1 + d 2 )/2 21 12 output input d e d    2 1 1 d r ed  
Background image of page 22
23 Nomenclature For internal gears, sense of rotation does not change Gear basics 21 12 output input d e d  ω 2 ω 1 d 2 d 1
Background image of page 23

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
24 Gear basics Nomenclature base circle
Background image of page 24
Image of page 25
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/21/2010 for the course MECHENG 250 taught by Professor Stevis during the Fall '09 term at University of Michigan.

Page1 / 59

10-11 gears-all - ME250 Design and Manufacturing I Gears...

This preview shows document pages 1 - 25. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online