locomotive traction motor pinion EMD 9556211


SUPCO Canada Railway will prolong the locomotive traction motor pinion life span and reduce the maintenance costs of different types of traction motors.

How the improvement in the design of a traction motor pinion by SUPCO will prolong the pinion life span and reduce the maintenance costs of different types of traction motors.
When it comes to traction motor pinion gears, there is always a slight sliding or slipping on both sides of pitch point over tooth curvature. This sliding causes pitting and damages the traction motor pinion teeth, which as a consequence produces torsional vibration when rotating the gearwheel, and damaging the traction motor. In this paper, SUPCO demonstrates the root cause of such damages and proposes the method for how to improve the traction motor pinions. Contact SUPCO for more information on traction motors.






About SUPCO

SUPCO is a company that is producing and exporting Traction Motor Pinion Gears. It includes experts from different branches of Locomotive designing to establish a potential atmosphere for competition in order to create the most qualified Locomotive Traction Motors. Our company is a highly dependable compound for the best North American producers, which offers a long-term relationship and gives after-sale services to customers. To see our products, more information on traction motor pinion visit the Traction Motor Products page on our website. Also, check other articles on our blog for different types of traction motors and details of AC vs DC traction motors.

 An Intruduction to Locomotive traction motor Pinion :

Transmission of rotational force from one axle to the other has a long history by using pulley and belt. This is still in use for many applications. However, when there is a high amplitude of force then due to tangential traction between belt and pulley, and limited fraction counterforce, slipping between locomotive traction motor pinion gear will be the main issue. Clip 1. Therefore, an alternative means of transmission such as spur gear is to be utilized.

How SUPCO overcame the chalanges faced in designing Traction Motor Pinion Gears :

 



To overcome mentioned issues on pinion, and the costs on Traction Motors repairs, as a result of faulty pinions , the material or steel alloy for manufacturing and the process of manufacturing has a significant impact on the quality of pinion, the manufacturing process mainly include carburizing/Decarburizing process, and case hardening are the 2 main  important factors for a qualified Pinion,  see section 6 Reference Standard, ASTM, 837, and EMS 157.

In supplying pinions to its clients, SUPCO has the necessary information and technical experience for how to assess the manufacturer facilities,  test and quality control the pinion received from its vendors and manufacturers.

Further, SUPCO in its consulting project helps the clients  verify the root cause of defective locomotive pinions, and advise the best way to solve the problem.

Case hardening produces a very hard gear tooth surface which is more wear resistant  compared to gearing made in the past. Carburizing and hardening is done in Quench Furnace, or by induction. As per technical condition, Bore and Threads should be free from case so we do heat treatment in two steps:

First Step;

a) Only carburizing operation after teeth cutting and rough machining keeping sufficient

machining margin more than total case depth i.e. 2.5 mm.) in bore & thread portion dia O

4.939'.

b) After carburizing, we remove the case of bore and O 4.938"portion, where threads must be cut keeping machining and grinding allowances.

Second Step;

Hardening & Tempering:

After doing above operation, finally the material is sent for hardening & Tempering.

Cycle of plain carburizing:

Preheating is done up to 450" C and kept for one hour (Soaking time)then heat up 940"C i.e.



at austenizing temperature, and kept for 2 hours under CP 1.5 I, then it is boosted for t hours for 2.5 mm cast depth. Then we defuse it for 4 hours minimum * soak for t hours then we refrigerate it in furnace up to


520"C+ then take out from the furnace and wait until it gets cooler it in the air . When we check the hardness, it is understood that it has achieved 26 to 28 HRC, which is compatible with the machine.


After bore machining & thread cutting , we send it for hardening and tempering.


Cycle of hardening and tempering:

a) Hardening Cycle:

Preheating up to 450"C and kept for one hour (Soaking time) . Then heat up to hardening


temperature. 870"C and kept for 2 hours (for homogenization ) . Then quench in agitated quenching oil


(oil temperature 50"C) ) kept in quenching tank for 20 to 25 minutes.


b) Tempering Cycle:

Heat up to 180"€ and kept for 2 hours, then we wait until it gets cool in air..

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