TR

Flexible shafts

 

TR flexible shafts are highly versatile models that can be supplied also with different types of protective covers based on the type of application:
- transfer torque where a direct connection is not possible
- substitution of unprotected
- complex, or dangerous mechanisms
- remote operation of mechanisms
- reduce the overall weight of mechanisms
- bypass obstacles below, above, or around


Version «A» = without protective cover

 

Version «B» = with “Rilsan” protective cover

 

recommended for protection against oil, grease, dirt, corrosive agents, nearby elements of the machine, etc.
- Black Rilsan for ø 6 - 8 - 10 - 12 – 15 mm sizes;
- White Rilsan for ø 20 mm size


Version «C» = with galvanized steel reinforced cover
 

recommended to increase mechanical robustness in particularly heavy working conditions.

 

• Terminals made of stainless steel AISI 303, available models (see section "Accessories"):

- cylindrical solid CL  - cylindrical female CF  - square Q
cylindrical male CM                       - cylindrical male/bushing CMB

Photogallery

Model  < TR-A >  without protective cover 

 

    

DIMENSION TABLE
VERSION FLEXIBLE SHAFT
  Ø A
TR6A 6
TR8A
TR10A 10 
TR12A 12 
TR15A 15 
TR20A 20 
The data refers to length L=1000mm
 
 
 
Model  < TR-B > with protective cover made of  "Rilsan"


Black “Rilsan” plastic for  ø6-8-10-12-15 mm sizes;
White "Rilsan” for a ø20 size.

DIMENSION TABLE
VERSION FLEXIBLE SHAFT EXTERNAL COVER TERMINAL COVER LENGTH + 6mm*
   Ø A Ø B   Ø C
TR6B 6 12 11 24
 TR8B 14  13  44 
  TR10B 10  18  15  50 
  TR12B 12  20  18  64 
  TR15B 15  22  20  56 
  TR20B 20  30  28  63 
*Length + 6 (between terminal and cover terminal) 
 The data refers to length L=1000mm           




Model < TR-C > with protective cover made of zinc-coated steel 

DIMENSION TABLE
VERSION FLEXIBLE SHAFT EXTERNAL COVER TERMINAL COVER LENGTH +6mm*
   Ø A Ø B  Ø C 
 TR6C 6 14 18 34
 TR8C 17  21  44 
 TR10C 10  20  24  50 
 TR12C 12  25  30  64 
 TR15C 15  30  35  56 
 TR20C 20  35  40  63 
*Length + 6 (between terminal and cover terminal) 
The data refers to length L=1000mm            


FIXING TERMINALS
made of stainless steel AISI 303, available models:

 = square
 
 
FLEXIBLE SHAFT  EXTERNAL SQUARE TOTAL LENGTH
Ø A Ø B
6 5 30
8 6.5 35
10 8.5 40
12 10 40
15 13 45
20 17.5 45

 

CL = cylindrical solid
 
 
FLEXIBLE SHAFT EXTERNAL DIAMETER TOTAL LENGTH AVAILABLE LENGTH
Ø A Ø B D
6 10 28 12
8 12  38 16 
10 14  44 20 
12 16 48 22 
15 20  50 25 
20 25  57 30 

 

CF = cylindrical female
 
FLEXIBLE SHAFT EXTERNAL DIAMETER TOTAL LENGTH BORE DEPTH KEYWAY BORE
Ø A Ø B D E Ø F
6 10 28 10 = 6
8 12  38 15  = 8
10 14  44 15  = 8
12 16 48 16  3 10
15 20  50 16  3 10
20 25  57 20  5 14

 

CM = cylindrical male
 
FLEXIBLE SHAFT EXTERNAL DIAMETER TOTAL LENGHT AVAILABLE LENGTH KEYWAY MALE DIAMETER
Ø A Ø B D E Ø F
6 10 28 10 = 6
8 12  38 14  = 8
10 14  44 14  = 8
12 16 48 15 3 10
15 20  50 15  3 10
15 20 50 15 5 14*
20 25  57 20  5 14

* optional

CMB = 2 piece connection bushing
 
 
FLEXIBLE SHAFT EXTERNAL DIAMETER TOTAL LENGHT AVAILABLE LENGTH KEYWAY BORE EXTERNAL BUSHING
Ø A Ø B D E Ø F Ø G
6 10 28 10 = 6 14
8 12  38 14  = 8 22
10 14  44 14  = 8 22
12 16 48 15 3 10 24
15 20  50 15  3 10 24
15 20 50 15 5  14* 32*
20 25  57 20  5 14 32

 * optional

 

2 pieces connection bushings with screws to couple gearboxes and shafts.

Support units (with square flange) with o.ring, and ball-bearings.

• Available shafts Ø6, Ø8, Ø10, Ø14, Ø20.
• On request threaded bores or drillbores for screws.
• They can be used severally on screws, female screws, shafts or can be combined with our flexible shafts, and our position indicators type “OP”.
• Particularly the combination with flexible shafts an position indicators offers a simple and complete solution for handling and display of motion
  • AVAILABLE VERSIONS
    S2 = albero Ø6 S4 = albero Ø8 S5 = albero Ø10
    S6 = albero Ø14 S8 = albero Ø20


     

Flanged supports with extension shaft for coupling with position indicators.

 

AVAILABLE VERSIONS 
S2 FL OP2 S4 FL OP3

 

S5 FL OP3 S5 FL OP7/EP7


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EFFICIENCY TABLE <TR> version A - B - C
FLEXIBLE SHAFT TORSION MIN. BENDING RADIUS TORQUE WEIGHT <TR-A> WEIGHT <TR-B> WEIGHT <TR-C>
Ø A (°) mm  Nm  gr  gr gr 
6 80 70  3 400  600 800
70  90  4.5  600  800  1150 
10  70  130  7.5  800  1000  1450 
12  50  160  950  1350  1800 
15  28  300  12  1200  1750  2200 
20  18  400  18.5  1700  2150  3600 
The data refers to length L=1000mm

 

MECHANICAL CHARACTERIZATION OF FLEXIBLE SHAFTS

Flexible shafts are mechanical elements which are subject to torque and undergo a rotational elastic deformation. Considering a single flexible shaft, the equal and opposite torques which are applied at each extremity cause a relative rotation of the various sections which is proportional to the distance between the sections. The relation between Applied Torque [Nm] and Twist Angle of the extremities φ [°] is a function of three parameters as follows: 

Torsional Rigidity k [103Nm/°] which depends on the section diameter and its construction characteristics
Length of the shaft L [mm]
  Rotation Direction (dimensionless parameter which characterizes the asymmetric behavior of the shaft) 

  φ = T . L  
        rk
  T = rk . φ
         L
  

Parameter r is equal to 1 when the shaft is loaded according to the winding direction of the spiral; when loaded in the opposite direction, r < 1 as indicated in the following table:

PARAMETERS OF FLEXIBLE SHAFT
Diameter Ø

k
[103Nm/°]

r

Tmax
[Nm]

Tmax [Nm] φ [°]
(L=1000mm, Tmax) 
4 17 0.55  1.1  64.71
26 0.55 1.8 

69.23 

38  0.55  3.0  78.95 
8 67  0.55  4.5  67.16 
10  101  0.55  7.5  74.26 
12  180  0.65  9.0  50.00 
15  405  0.80  12.5  30.86 
20  1050  0.85  18.5  17.62 

 

BENDING EFFICIENCY  

The above shows a qualitative-quantitative curve of the efficiency of the flexible shaft as a function of the bending radius.
For configurations which are almost in a straight line, the efficiency is equal to the maximum value 0.9.
The efficiency is nearly constant for high values of the bending radius and decreases rapidly down to 0.2 as the minimum bending radius is approached.

     

1. Efficiency 
2.
Bending radius/R min.

DIAGRAM SHOWING TWIST ANGLE VS TORQUE FOR SHAFTS WITH A TOTAL LENGTH  L=1000mm

 

  FOR DIAMETERS FROM Ø4 TO Ø10


1. Twist angle φ [°]
2. Torque (Nm)

 FOR DIAMETERS FROM Ø12 TO Ø20


1. Twist angle φ [°]
2. Torque (Nm)

 GENERAL EFFICIENCY TABLE

1. Power P (kw)
2. Rotation per minute (rpm)

- To identify the most suitable flexible shaft for your requirements, refer to the values in the table. If the real loads and efficiency are very close to the table values, contact the technical department.
- To choose the most suitable flexibel shaft, we advise to consult the figures, tables, and the technical data shown in the “General Information” of this site.
- All tables show linear measurements expressed in <mm>, unless otherwise specified. All forces, efficiency and the loads are expressed in <N or Nm> (10 N ≅ 1 kg or 10Nm ≅ 1Kgm) unless otherwise specified.