Vbelt and Pulley Design
Vbelt and Pulley Design
(OP)
Hello folks,
I have a dual drive skid that are Vbelts. A compressor is driven by either a Electric Motor or a diesel engine. The compressor sits in between the electric motor and the diesel engine. All pulleys/sheaves are rotating counter-clockwise. Engine and motor both have clutches for disengangement.
1. Compressor has a Pulley of 11.75 PCD 4 grooves running at 1340rpm which is the critical speed.
2. Engine has a Pulley of 6.6 PCD 2 groove running at 2386rpm
3. Electric motor Pulley to be designed, (2 grooves) Maximum RPM of motor is 1500rpm
My question is,
1. is there a minimum center to center sheave distance that is common industry practice? The belts are SPB type (compressor is british) and the engine is B type. Hope these will fit fine on the pulley
Based on the electric motor rpm of 1500 I have a Pulley size of 10.5"PCD
I have a dual drive skid that are Vbelts. A compressor is driven by either a Electric Motor or a diesel engine. The compressor sits in between the electric motor and the diesel engine. All pulleys/sheaves are rotating counter-clockwise. Engine and motor both have clutches for disengangement.
1. Compressor has a Pulley of 11.75 PCD 4 grooves running at 1340rpm which is the critical speed.
2. Engine has a Pulley of 6.6 PCD 2 groove running at 2386rpm
3. Electric motor Pulley to be designed, (2 grooves) Maximum RPM of motor is 1500rpm
My question is,
1. is there a minimum center to center sheave distance that is common industry practice? The belts are SPB type (compressor is british) and the engine is B type. Hope these will fit fine on the pulley
Based on the electric motor rpm of 1500 I have a Pulley size of 10.5"PCD





RE: Vbelt and Pulley Design
Mike Halloran
Pembroke Pines, FL, USA
RE: Vbelt and Pulley Design
Is the sheave mounted directly on the motor crank?
RE: Vbelt and Pulley Design
Once you have a preliminary pulley size, you need to calculate the belt pull forces, and check that each of the rotating components can deal with the radial load from the belt pull, and the moment from the belt location and the belt pull.
Electric motors, for one instance, are often equipped with smallish bearings that can't take much of a radial load, unless you special order a motor with larger bearings.
Similar concerns apply to the engine and to the compressor.
Mike Halloran
Pembroke Pines, FL, USA
RE: Vbelt and Pulley Design
5V belts have the same angle as SPB belts. Check their website for all information required.
Russell Giuliano
RE: Vbelt and Pulley Design
I seem to remember a rule of thumb that said the minimum center to center distance has to be twice the diameter of the larger pulley.
Thanks
RE: Vbelt and Pulley Design
Please disregard my erroneous rule of thumb above. I decided to do some checking (my memory isn't what it used to be) and found the link below. The second article should help with your question of distance between pulleys.
Thanks
http://i
RE: Vbelt and Pulley Design
e: distance center to center
d1: effective diameter of pulley 1
d2: effective diameter of pulley 2
e>0,7(d1+d2)
e<2(d1+d2)
I´ve used this limits many times and worked very well
RE: Vbelt and Pulley Design
You MUST check the radial load limits on the engine, the motor, and the compressor.
You may end up with three jackshafts.
BTDT.
Mike Halloran
Pembroke Pines, FL, USA
RE: Vbelt and Pulley Design
SBI
Central Ne.,USA