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| d | D | D1 | L |
| 14.5 |
12.4. Designing lubrication system of the speed reducer.
Lubrication serves to decrease frictional loses, to offer protection against corrosion and to improve speed reducer operation. The usual lubricants for meshing elements, bearings of the speed reducer are mineral and synthetic oils and greases.
The basic parameter of any oil is its viscosity that characterizes the ability of fluid layers to resist flow. The oil viscosity is chosen depending upon the expected peripheral speed, load and tooth materials. It should be raised with increasing load and decreasing speed. The oil viscosity is determined according to table 12.21and 12.22. The oil is chosen by table 12.23.
Table 12.21
Recommended viscosity of oils for lubricating gearing when t=50°C
| Contact stresses, s H, MPa | Kinematic viscosity, 10-6 at peripheral speed V, m/sec | ||
| Up to 2 | Over 2 to 5 | Over 5 | |
| Up to 600 | |||
| Over 600 to 1000 | |||
| Over 1000 to 2000 |
Table 12.22
Recommended viscosity of oils for lubricating worm gears when t=100°C
| Contact stresses, s H, MPa | Kinematic viscosity, 10-6 at peripheral speed V, m/sec | ||
| Up to 2 | Over 2 to 5 | Over 5 | |
| Up to 200 | |||
| Over 200 to 250 | |||
| Over 250 to 300 |
There are two methods of lubrication:
- immersion lubrication, when toothed wheels are immersed into the oil bath;
- stream lubrication, when oil feeds the contact area of toothed wheels by means of special nozzles.
Table 12.23
