| Helical
Gears |
| |
|
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120
DP - 1.5 DP |
|
.2
Mod- 16 Mod |
|
6
teeth -200 teeth |
|
O/D:
1mm - 1.4 metres |
|
Internal
Helical Gears (Information on
request) |
|
 |
 |
| Bevel
Gears |
| |
|
|
24
DP- 3 DP |
|
1
Mod - 8 Mod |
|
8
teeth -200 teeth |
|
O/D:
10mm - 600mm |
|
Bevel/miter
gears can be manufactured in steel,
nylon, cast iron or stainless
steel |
|
| Spur
Gears |
| |
|
|
120DP
- 1.5DP |
|
2
Mod - 16 Mod |
|
6
teeth -400 teeth |
|
1mm
diameter to 1400mm diameter (O/D) |
|
Gear
shafts and pinions |
|
Internal
spur gears (25 inch or 600mm PCD) |
|
Stainless
steel spur gears, recommended
for use in the food and chemical
industries, are manufactured by
I-trans |
|
Nylon
spur gears can be machined from
moulded nylon resin.
Their features are:
| 1. |
impact and vibration absorbing |
| 2. |
self lubricating |
| 3. |
lightweight and smaller
inertia |
| 4. |
resistant to fatigue and
wear |
| 5. |
corrosion proof |
| 6. |
noise reducing |
|
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 |
 |
| Ratchet
Gears Wheels |
| |
|
|
6
teeth -400 teeth |
|
Single
or double sided |
|
Can
be cut to any form |
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|
| Common
Gear Calculations & Questions |
| |
|
| (1) Pitch
of a Gear |
| |
Module(m) and diametrical pitch
(p) are measurements of the tooth
size. Module in millimeters and
diametrical pitch in inches are
interrelated as follows:
m=25.4/p, and p=25.4/m (The bigger
the m number, the bigger the tooth
size, and the smaller the p number
the bigger the tooth size). An
example of this would be as follows:
25.4/2 module = 12.7 DP, and 25.4/12
DP = 2.116 module. |
| |
|
| (2) Outside
diameter of module and DP spur
gears |
| |
Module: Number of teeth + 2
x mod = OD in millimeters
e.g. 20T3 Mod: 20+2x3 = 66mm
Diametrical Pitch: (Number of
teeth +2)/DP = OD
e.g 20T10 DP: (20+2)/10 = 2.200
inches |
| |
|
| (3) Ways
to eliminate gear noise |
| - |
Correct tooth contact; relieving
the tooth tip will prevent end
contact, tooth profile modification,
and adjustment to the pressure
angle. |
| - |
Correct backlash; nylon gears
for example require more backlash
than steel gears. |
| - |
Increase contact ratio; helical
gears for example are quieter
than spur gears. |
| - |
Nylon gears; depending on the
application these maybe quieter
than steel gears. |
| - |
Lubrication; high viscosity
oil will reduce noise. |
| |
|
| (4) Gear
Ratios |
| |
If for example you have a drive
where a 20T gear is driving a
40T gear that would be described
as a 2:1 reduction. |
| |
|
| (5) Information
that is useful for i-trans |
| - |
What power is being put through
the drive and what is the application |
| - |
What kind of gears: spurs, helicals,
bevels etc. |
| - |
General configuration of the
gear train: how many gears and
shafts |
| - |
What is the industrial environment
like: dusty, dirty, food related
etc. |
| - |
How many teeth |
| - |
OD of gear, width of teeth,
shaft size , hub diameter, length
and bore diameter, keyway |
| - |
Material of gear: nylon, stainless
steel, steel |
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