Wheel flange lubrication


Go to content

Direct lubrication

Description

back

Direct lubrication
The medium lubricator as a liquid including solid parts gets through the air gap because of its high density
FROM the valve nozzle TO the targeted area, the GAUGE EXACTNESS SIDEWALL (of the WHEEL tire’s flanges, or in the end by being wiped off the RAIL)
So if this
THEORETICALLY is a good possibility of transferring, then it should be considered, if it is possible to create an option where lubricator is sprayed DIRECTLY to the gauge exactness sidewall or inside micrometre sidewall. Then the lubricator is applied DIRECTLY where it is PRIMARILY needed, WITHOUT ANY DETOURS.

Even this new developed (electro) hydraulic system, while
MAINTAINING the “spraying of the gauge exactness sidewall or inside micrometre sidewall of the WHEEL TIRE'S FLANGE” in connection with wipe off process of the gauge exactness sidewall of the rail or secondary rail, such spraying of the only as transfer element used “wheel tire's flange”, is still NOT the optimal solution.
A further disadvantage is that the lubricator which is applied to the wheel tire's flanges is transported to the outside due to speeds
centrifugal forces because of the wheel's circumference. This fact must be taken into consideration from the beginning. As soon as the lubricator is in the targeted area – rail fixed on solid ground – then it has the tendency to flow downwards due to earth's gravity.

Following drawing shows this case on the example of a grooved rail.

                                 


However,
DIRECT spraying of the rail's sidewalls is COMPLICATED. The main risk is spraying the running surfaces, which affects the coefficient of static friction in a negative way. The valve nozzles must be placed very low. Here the main reasons for their damages are:
- stones which lie in the grooves
- whirled up stones when running over the flanges
- coarsenesses caused by worn out railway switches....

The gauge exactness and rail cross-section must be taken into consideration when spraying the rail's sidewalls. Gauge exactness
tolerance is relatively large on wheels and rails (e.g. Deutsche Bahn AG: gauge exactness tolerance = 30 mm).
This fact reduces the
accuracy of the sprayed lubricator!
Tram 11 mm and DB 14 mm under the rail's upper edge measured vertical to the track.



The following shows measure points for track alignment, track width and permitted gauge widening, using the tram as an example.

                     



Following drawing and animation show the
DIRECT lubrication of the RAILS gauge exactness sidewall, alternatively the secondary RAIL sidewall.


                          
      
                      Drawing                                                                                  Animation


Both
holders with the valve nozzles are mounted on the bogie (or the railway body) facing the wheel tire. Valve nozzle s spray lubricator to different directions.

In practice, this variation is
ONLY realizable on wheels and rails, when handled with GREAT care and considering relatively large track gauge TOLERANCES.
Because of large track gauge tolerances it could be that the sprayed lubricator:
-
NOT ALONE hits the aimed surface
-
BUT ALSO hits the rail head RUNNING SURFACE, which is not intended.

Depending on the
application sensible COMBINATIONS can be created by:
- conventional spraying of the
wheels
   (= indirect lubrication of the gauge exactness sidewalls and the secondary rail sidewall)
AND
- spraying of the
rails
   (=
DIRECT lubrication of the rails gauge exactness sidewall and the rails running surface).

next






[print]                               [download]

Wheel flange lubrication | Aggregate | Slide show | Gallery | Description | Valve nozzle | Contact | Imprint | . | Nozzle d 0.2 | Brochure | . | Unique copy | Site Map


Back to content | Back to main menu