AEM-7 DRIVE SYSTEM

[PARTSGUY]

Hello, I'm just new to this site and i'm hoping to get some information about the type of drive system used under an AEM-7. From all the pictures I've been able to assemble off the NET, I can't figure out.....as my great grandson say's, "what make's the wheel's go 'round?" I know the GG-1, the Polar drive, the Pennsy side rod electric, but this engine's drive system escapes me. Is it the same as a diesel electric's, (I don't think so) or maybe it's the same as my MTH model of the same breed???? Two huge can motors hidden under the hood?? Since I bought this engine from eBay, I've gotten very curious about the real thing. The picture I have of the AEM's drive axle with the wheel's pressed on show's only the two disk brake rotors, no drive gear. Somebody on this site has my answer, and I'm hoping to hear from them. Thank's so much for any time you can spare with me. Bill Lester

[Fan Railer]

The propulsion setup should be the same as most other modern day electrics: Nose suspended traction system (or an updated quill design, although since the AEM-7 has wheel mounted disk brakes, i'm going for the more traditional nose suspended design). Motors are hung from the truck directly adjacent to the axle and connected to the axle through the reduction gear system.
http://www.railway-technical.com/drives.shtml
http://www.rdso.gov.in/electrical/publi ... rtb_06.pdf

some reference images (various types of rolling stock):



http://lh6.ggpht.com/_tPCeTcop5-E/SYDTn ... ccess..jpg
http://www.nycsubway.org/perl/show?24439

hope this sheds some light on the subject

[bogieman]

AEM-7's have the traction motor fully supported by the truck frame - they are not axle hung. The motor mounts at two points on the truck inboard transom and there is a support arm that provides the third point of support on the outboard transom. The gear case is structural - it is nose suspended to the truck frame and carries bearings that support it on the axle. The pinion is supported on bearings in the gearcase and there is a quill drive with flex coupling to the pinion and splines at the end of the armature opposite the gear case so it runs thru the hollow armature shaft.

This arrangement provides lower unsprung mass than if motor was axle hung but the big 51" wheels, brake discs and heavy gear case make the unsprung weight similar to an EMD D77 axle hung arrangement. The AEM-7 arrangement is fairly simple compared to the cardanic drives as on the ALP-46's but the cardanic drive offers lower unsprung mass since the gear case is also truck mounted.

[bengt]

http://i25.photobucket.com/albums/c63/b ... talj/4.jpg
The swedish Rc-locos have the same kind of motors and gearings as AEM7.
http://i25.photobucket.com/albums/c63/b ... talj/5.jpg

http://i25.photobucket.com/albums/c63/b ... talj/6.jpg

http://i25.photobucket.com/albums/c63/b ... talj/7.jpg

http://i25.photobucket.com/albums/c63/b ... talj/8.jpg

http://i25.photobucket.com/albums/c63/b ... talj/9.jpg

http://i25.photobucket.com/albums/c63/b ... alj/10.jpg

http://i25.photobucket.com/albums/c63/b ... /CSD/1.jpg
This czech motor have also the same arrangement as AEM7 with a cardan shaft through the holow motor axle.
http://i25.photobucket.com/albums/c63/b ... /CSD/2.jpg