Chain Drives Flashcards
What is a chain drive used for?
Transmit the force and Motion of a drive unit to a driven machine
Roller chain assembly can contain several types of links including -
Roller links
Pin links
Connecting links
Offset links
A roller link consists of -
Two bushing which are press-fit into two roller link plates
Two rollers which revolve freely on the bushing
Pin links consist of -
Two link plates which hold the pins
Roller links which pivot on the pins
Connecting links is used to -
Join a roller chain assembly, making it endless
A connecting link consist of -
Two pins press-fitted and riveted permanently to a link plate
A link plate which May have either a slip-fit or a press fit on the pins
A securing method (Spring clip, cotter pin, spring pins or rivets)
What is pitch?
The distance, in inches or millimetres between the centres of adjacent joint members
ANSI code has two Numbers , what do the digits on the right stand for? Either 0,1,5
O = usual or regular proportion
1= lightweight
5 = rollerless bushing chain
What are multiple-strand roller chains used for?
Transfer maximum power with the smallest pitch size
What are silent chains design for?
High-speed drives
Type a sprockets are designed -
Without hubs
Type B sprockets are design with -
A hub on one side only
Type C sprockets were design -
Hub projections on both sides
Type D sprockets are considered -
Detachable
What is a good amount of chain slack for up/down direction
4% to 6%
For one direction, slack shouldn’t be anymore than
2%
What are idler sprockets?
Used to take up chain slack where it is not possible to adjust centres
Recommend changing the chain should be replaced when extension be
1% to 2% depending on the speed and operation conditions
Old chain\ New chain x 100, this is the blank??? Formula
Stretch
What way should a chain connecting pin be facing
Closed end towards direction of travel
Chain 35
3/8, rollerless
How would you set chain slack (tension) on vertical chain drive?
Run the chain at 1/4 chain pitch deflection
How often should you inspect roller chains newly placed into service?
First 100 Hours, then every 500 there after