Traction Rolling Stock - Indian Railways Institute of Electrical ...

3. POWER TRANSMISSION & DRIVES
3.0 TYPES OF DRIVES
Arrangement of transmitting torque produced by traction motor to axle/wheel is
known as drive.
3.1 DRIVE LOCOMOTIVES
Single Reduction gearing
WAM/4, WAG/5, WCAM/l, WAP/l-3, WCG/2,
WAG/6C,WAG/7,WAG/9,WAP/4,WAP/5, WAP/7
Jacquemin Drive
Quill Drive
WN Coupling drive
Rotor Hallow Shaft
WAM/1, WAG/1,3,4.
WAG/2
WAM/6B, YAM
WAG/6A.
3.2 SINGLE REDUCTION GEAR DRIVE
In this type of drive, pinion mounted on traction motor shaft, directly drives the main
gear, which mounted on the axle, torque from motor pinion is transmitted through the main gear.
3.3 JACQUEMIN DRIVE
Torque is transmitted from traction motor pinion to elastic gear, Elastic gear to
intermediate pinion Intermediate pinion to Intermediate gear wheel Intermediate gear wheel to
Main gear
Main gear is mounted on bearing, which is supported by gear case. Main gear is
mechanically connected to cardan shaft (hollow shaft). Torque from main gear is transmitted to
cardan shaft, and cardan ring, which is mechanically coupled to wheel by resilient arrangement. In
this case one motor drives two wheel. This drive permits power transmission from the cog wheel
(main gear) to the axle regardless of the vertical up and down movements of the axles due to
springing.
Transmission in Bo-Bo type wheel arrangement Jacquemin drives is Traction motor
pinion to Intermediate gear Intermediate gear to main gear/main cog wheel Main cog wheel to
cardan ring/driving ring driving ring to hollow shaft Hollow shaft other end driving ring Driving ring
to wheel.
Driving ring/ cardan ring is mechanically connected to wheel on the opposite side of
main gear through silent block articulation (this is elastic rubber bushes). Jacquemin transmission
is designed for a tractive effort of 15t per bogie.