IB Design Technology Topic B3.3.4 Gear and Belt-driven System Applications Revision Notes (HL)

IB Design Technology Topic B3.3.4 Gear and Belt-driven System Applications Revision Notes (HL) | RevisionDojo

Written by official IB examiners

Gear and Belt Systems: Working Out the Output Speed

Gear and belt systems do not just move things. They trade speed against torque, and the ratio decides the exchange rate.
Designers use them to:
1. Increase or decrease speed
2. Increase torque (rotational force)
3. Reverse the direction of rotation
4. Transfer motion between different axes

Understanding the System

$$\text{Gear ratio} = \frac{\text{Driven gear teeth}}{\text{Driver gear teeth}}$$

Common Mistake

Get the ratio the right way up: it is driven ÷ driver, not driver ÷ driven.
Invert it and every conclusion flips: you would predict a speed increase where the machine actually slows down.
Sanity-check with the physical intuition: a small gear driving a big one must turn the big one slowly. So a 12-tooth driver on a 48-tooth driven gives a ratio of 4, and the output runs at a quarter of the speed.

A high gear ratio → more torque, less speed
A low gear ratio → more speed, less torque

Nice try, unfortunately this paywall isn't as easy to bypass as you think. Want to help devleop the site? Join the team at https://revisiondojo.com/join-us. exercitation voluptate cillum ullamco excepteur sint officia do tempor Lorem irure minim Lorem elit id voluptate reprehenderit voluptate laboris in nostrud qui non Lorem nostrud laborum culpa sit occaecat reprehenderit

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Unlock the rest of this chapter with a free account

End of article

Gear and Belt Systems: Working Out the Output Speed

Gear and belt systems do not just move things. They trade speed against torque, and the ratio decides the exchange rate.
Designers use them to:
1. Increase or decrease speed
2. Increase torque (rotational force)
3. Reverse the direction of rotation
4. Transfer motion between different axes

Understanding the System

$$\text{Gear ratio} = \frac{\text{Driven gear teeth}}{\text{Driver gear teeth}}$$

Common Mistake

Get the ratio the right way up: it is driven ÷ driver, not driver ÷ driven.
Invert it and every conclusion flips: you would predict a speed increase where the machine actually slows down.
Sanity-check with the physical intuition: a small gear driving a big one must turn the big one slowly. So a 12-tooth driver on a 48-tooth driven gives a ratio of 4, and the output runs at a quarter of the speed.

A high gear ratio → more torque, less speed
A low gear ratio → more speed, less torque

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Unlock the rest of this chapter with a free account

End of article

A. Design in theory8 subtopics

B. Design in practice8 subtopics

C. Design in context8 subtopics

IB Design Technology Topic B3.3.4: Gear and Belt-driven System Applications Notes

A. Design in theory8 subtopics

B. Design in practice8 subtopics

C. Design in context8 subtopics

Gear and Belt Systems: Working Out the Output Speed

Understanding the System

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Gear and Belt Systems: Working Out the Output Speed

Understanding the System

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account