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Advantage of Double Enveloping It is reported that the benefits derived from the double-enveloping design are truly dramatic.
One advantage is that the total load here, gets divided among individual gear teeth. As a
result of this, there is considerable enhancement in the load carrying capacity. Secondly, there
is improvement in the torque throughput. This allows for a smaller size reducer to even
produce the same amount of torque. This leads to size and weight savings.
Ratio
Cylindrical
Worm For 4''
center distance
Double
enveloping
Worm gear For
4'' center
distance
10:1
10.71 HP @
1750 RPM
3304lb.In.Output
Torque
18.40 HP @
1750 RPM
6190lb.In.Output
Torque
25:1:00
5.08 HP@ 1750
RPM
3743
lb.In.Output
Torque
8.13 HP@ 1750
RPM
6370
lb.In.Output
Torque
Lubrication for Worm Gears
Lubrication for Gear oil is a challenge in itself. In worm gears there is continuous sidewaysliding motion. This makes it hard in maintaining a hydrodynamic oil wedge. The result is
gears operating under conditions of boundary lubrication. Also, high operating temperatures
that sometimes borders on 190°F (88°C) and even higher generally requires oil with a
specification of ISO VG of 460 (AGMA Class 7) or even higher. These oils also need good
oxidative and thermal stability.
The types of lubricants that are commonly applied for worm gears are the following:
Compounded mineral oils - Finds extensive use in worm gears
- The temperature limitation is around 180°F (82°C)- Normal use of AGMA Class 7 or Class 8 compounded oils (ISO VG 460 and 680)
Extreme Pressure (EP) mineral gear oils - Also extensive use in high temperature and pressure
- Normal use of AGMA 7 and 8 viscosity grades
- The temperature limitation just like Compounded mineral oils is around 180°F
(82°C)
Synthetic worm gear oils - Major types are polyalphaolefins and polyalkelene glycols