richardsun
Member
- Joined
- 4 Jul 2011
- Messages
- 31
Hi all... for a while I've been pondering a couple of things about how bogies connect with the chassis of a rail vehicle.
I know this will be simple stuff to somebody out there, perhaps you could enlighten me!
1) I assume bogies have some sort of central pivot pin, or bearing, which the vehicle chassis sits on. Does this just rely on gravity (I assume not) or is there a more positive connection? I've seen rail accident photos where vehicles seem to fairly readily part company with their bogies!
2) Some vehicles have airbags, springs, dampers etc between the rotating bogie and the body of the vehicle. For example, airbags on Class 150 DMUs, springs on Class 87 (photos attached). How do these accommodate the rotation of the bogies relative to the fixed body of the vehicle?
3) Thinking of DMUs with mechanical transmission - how does the engine/gearbox fixed to the vehicle chassis, transfer power to the bogies, which can rotate relative to the chassis?
Appreciate any explanations!
I know this will be simple stuff to somebody out there, perhaps you could enlighten me!
1) I assume bogies have some sort of central pivot pin, or bearing, which the vehicle chassis sits on. Does this just rely on gravity (I assume not) or is there a more positive connection? I've seen rail accident photos where vehicles seem to fairly readily part company with their bogies!
2) Some vehicles have airbags, springs, dampers etc between the rotating bogie and the body of the vehicle. For example, airbags on Class 150 DMUs, springs on Class 87 (photos attached). How do these accommodate the rotation of the bogies relative to the fixed body of the vehicle?
3) Thinking of DMUs with mechanical transmission - how does the engine/gearbox fixed to the vehicle chassis, transfer power to the bogies, which can rotate relative to the chassis?
Appreciate any explanations!