Caterpillar Engine Rolling Torque

[HookedOnHalo]

I'm reading some technical information on a Caterpillar 3616 engine that says

"Maximum rolling moment/torque: It is the phased summation maximum of all cylinders over one full engine cycle (720 degrees)"
see page 22 of the attached document.

I'm not familiar with the concept of rolling torque or what it means. Can anyone offer any references to understand what a rolling torque is an how it is calculated?

 

[MikeHalloran]

I think it's the number you need in order to size the engine mounts.


Mike Halloran
Pembroke Pines, FL, USA

 

[MikeHalloran]

Belay that WAG.

I found an A&I guide for 3600 gas engines that gives rolling torques at various speeds for various compression ratios, suggesting that it's calculated using component inertias and gas pressures. Fine, but the same tables include 'maximum torque' numbers ten times bigger, and 'minimum torque' numbers five times bigger.

I don't know what the hell it means. Maybe some CAT expert will drop in and explain it to both of us.


Mike Halloran
Pembroke Pines, FL, USA

 

[SomptingGuy]

"Maybe some CAT expert will drop in and explain it to both of us"

He doesn't tend to hang around these parts. Better off moving to the engine and fuel engineering forum.

- Steve

 

[rob768]

or just ask your local cat representative?

 

[catserveng]

It would probably be better if they had called it "roll torque moment", it is the calculated side to side movement force around the axis of the crankshaft when load is applied and removed. It is used during the design of mounting systems, bases, foundations and siesmic restraints.

Hope that helps, Mike L.

 

[rob768]

so, basically the force to calculate foundation bolts with?

 

[catserveng]

Depends on the mounting system and application, yes, can use it to help figure out bolt size, also base dimension and stiffness for portable equipment, and the like.

Mostly the oil and gas customers are the ones who request this data most frequently.

Hope that helps, Mike L.