Poona Couplings
 

Flexible Coupling ( PM ) - Coupling Manufacturer

Flexible Couplings ( PM )
Rating: 0.4 to 600 kNm – Max Torque
 
 
 
 
Flexible Couplings ( RB )
PM Features And Benefits
 
POONA COUPLINGS have been leaders in thw design and manufacture of flexible couplings for over 25 years with the following capabilities

1. Approved to ISO 9001-2008 Certificate & API
2. Total quality system
3. Latest CAD technology
4. Torsional vibration analysis
5. Transient and finite element analysis

APPLICATION

• Metal Manufacture
• Mining and mineral processing
• Pumps
• Fans
• Compressors
• Cranes and hoists.
• Pulp and Paper Industry
• General heavy duty industrial application
 
FEATURES BENEFITS
Severe shock load protection giving protection and avoiding failure of the driveline under high transient torques
Intrincially fail safe Ensuring continuous operation of the driveline in the unlikely event of rubber failure or damage
Maintenance free With no lubrication and adjustment required resuling in low running cost.
Vibration control Achieving low vibratory loads in the driveline components by selection of optimum stiffness characteristics
Zero backlash Eliminiating torque amplification through pre compression of the rubber elements
Misalignment capability Allows axial and radial misalignment between the driving and driven machines.

Low cost

The PM Coupling gives the lowest life time cost.
 
Construction details
• PM Couplings upto PM 40 are made out of special grade S.G. Iron. Couplings from PM 60 to PM 600 are made of steel casting
• Seperate rubber elements with a choice of grade and hardness, styrene butadiene with 60 shore hardness
( Sm60 ) being the standard
• Rubber elements loaded in compression
• rubber elements are totally enclosed.
Flexible Couplings
 
PM Shaft To Shaft PM 0.4 To PM 60
 
Flexible Couplings
Dimensions, Weight, Inertia and Alignment
 
PM Shaft To Shaft PM 90 To PM 600
PM Shaft To Shaft PM 90 To PM 600
 
PM Mili Motor Couplings
PM Mili Motor Couplings
Brakedrums may be used in conjunction with the whole range of PM couplings and may be bolted on either the driving flange or flexible half side of the coupling- ǾA - locating on the outside diameter or the coupling
Recommended brake drums for each size of coupling are show in the table, but ǾV is adjustable to suit "Non-standard" application
 
Type PM-SDW Dimensions Table (Ingot Motor)
 
PM Mili Motor Couplings
Type PM-SDW Dimensions Table (AISE Motor), Series 6 Mili Motors
Series 8 Mili Motors
PM TECHNICAL DATA
1.1- Prediction of the System torsional vibration Characteristics---
An adequate prediction of the system torsional vibration characteristics can be made by the following method--
1.1.1-- Use the torsional stiffness as shown in the technical data, which is based upon data measured at 30o C ambient temperature ( C
1.1.2-- Repeat the calculation made as 1.1.1 but using the maximum temperature correction factor ST and dynamic magnifier correction factor M100 for the corrected rubber. Use tables below to adjust values for both torsional stiffness and dynamic magnifier i.e. CTdys = c X S
 
1.13- Review calculations 1.1.1 and 1.1.2 and if the speed range is clear of criticals which do not exceed the allowable heat dissipation value as published n the catalogue, then the coupling is considered suitable for the application with respect to the torsional vibration characteristics. If there is a criticalo in the speed range then actual temperature of the speed range then actual temperature of the coupling will need be calculated .
 
1.2-PREDICTION OF THE ACTUAL COUPLING TEMPERATURE AND TORSIONAL STIFFNESS.
1.2.1 Use the torsional stiffness as published in the catlogue this is based upon data at 30 C , and the dynamic magnifier at 30 C ( M 30 )
1.2.2 Compare the synthesis value of the calculated heat load in the coupling ( Pk ) at the speed of interest in the " Allowable heat dissipation " ( Pkw )
C = Temp = ( Pk / Pkw ) X 70
The coupling temperature is =O
then O = Temp + Ambient temp.
1.2.3- Calulate the temperature correction factor St from 1.3 ( If the coupling temperature > 100 C , then use S Calculate the dynamic Magnifier as per 1.4. Repeat the calculation with the new value of coupling stiffness and dynamic magnifier.
1.2.4- Calculate the coupling temperature as per 1.2. Repeat calculation until the temperature agrees with the correction factors for torsional stiffness and dynamic magnifier used in the calculation .
 
TEMPERATURE CORRECTION FACTOR
1.4 Dynamic magnifier Correction Factor
The Dynamic Magnifier of the rubber is subject to temperature variation in same way as the torsional stiffness
 
PM TECHNICAL DATA - Standard Block (0.4 - PM 60)
 
PM TECHNICAL DATA - Standard Block (PM90 - PM 600)
 
PM TECHNICAL DATA Special Round Block (PM12 - PM 600)
 
PM 6 -WITH SP DF-BRAKE DISC - LONG SHAFT - ASSY PM 18 ASSY WITH BRAKE DISC & SPACER
   
PM 18 SHAFT TO SHAFT WITH B&K AND SPACER - ASSY DRG PM 27 - ASSY - UNDERWATER
   
PM- 27 - ASSY WITH SHEAR PIN & SPACER PM 40 ASSY LONG SHAFT
   
PM 40 WITH STUB SHAFT & SPACER PM - 60 - SHAFT TO SHAFT ASSY WITH SPACER
   
PM - 60 - SHAFT TO SHAFT WITH SPACER PM - 60 - ASSEMBLY
   
PM - 60 - VERTICAL ASSY DRG WITH B&K PM - 130 - SHAFT TO SHAFT WITH SPACER - ASSY DRG
   
PM - 11 - 130 - SHAFT TO SHAFT WITH SPACER - ASSY DRG PM - 270 - ASSY DRG
   
PM - 400 SHAFT TO SHAFT B&K ASSY DRG  
 
   

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