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Backstops are used extensively on pumps used in the primary and secondary cooling systems of power generating equipment.
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Sprag one way clutch S200
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introduction

 Sprag one way clutch S200

Feature

Type S200 is a non bearing supported sprag type freewheel. The sprags run directly on the shaft provided by the user. Bearings are required to support axial and radial loads. Lubrication and sealing must also be provided by the installation.

A typical arrangement is to install this type alongside a bearing as shown on the following page. The housing bore to receive the outer race will be machined with a H7 tolerance. A key will transmit the torque. The shaft on which the sprags run must have a surface hardness of HRc 60 to 62 for a finished depth of 0,6 mm minimum. Core hardness should be HRc 35 to 45. Surface roughness must not exceed 22 CLA. Maximum shaft taper 0,01 mm per 50 mm length.Concentricity between shaft and housing bore should be maintained within TIR 0,05 mm.

The preferred lubrication is oil. The Stieber design allows the use of most of the common lubricants used in power transmission including gear oils with EP additives. When necessary grease lubrication is also possible.


 

Type

Size

 

 

 

 

Over

running speeds

 

 

 

 

Drag torque

Weight

S200

 

 

d+0
          -0.025

TKN1)

nmax2)

namax3)

D

L

b

t

T r

 

 

 

 

[mm]

[Nm]

[min-1]

[min-1]

[mm]

[mm]

[mm]

[mm]

[Ncm]

[kg]

203

16,510

45

2400

500

40-0.014
-0.039

25

4

2.5

0.01

0.25

204

18,796

60

2400

500

47-0.014
-0.039

25

5

3

0.01

0.35

205

23,622

100

1800

400

52-0.017
-0.042

25

5

3

0.02

0.45

206

32,766

240

1800

350

62-0.017
-0.042

28

7

4

0.02

0.7

207

42,088

380

1800

300

72-0.017
-0.042

28

7

4

0.02

0.8

208

46,761

560

1800

200

80-0.017
-0.042

32

10

4.5

0.02

0.9

209

46,761

560

1800

200

85-0.020
-0.042

32

10

4.5

0.02

0.95

210

56.09

850

1200

200

90-0.020
-0.042

32

10

4.5

0.03

1

 

NOTES

1) T max = 2 × T KN
» Refer to Selection page 10 to 13
2) Inner race overruns
3) Outer race overruns
» Refer to mounting and maintenance instructions
page 16 to 19

MOUNTING EXAMPLE

 

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