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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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Backstop clutch AL ALP
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introduction

Backstop clutch AL ALP

Feature

Types AL, ALP are roller type freewheels. These units are part of the modular system. They are bearing supported, using two 160.. series bearings, and require oil lubrication. These units may be used in designs providing oil lubrication and sealing as on the example overleaf.

The bearings must not be axially stressed. Typically, types AL, ALP are used with standard covers that are designed to transmit torque, and provide oil  lubrication and sealing. Usually these covers are used in pairs according to combinations shown on the following pages.

The outer race of the AL model is plain to receive and center any component bored to H7 tolerance. Torque is transmitted by bolts through the cover plate in this case.
Types AL, ALP are identical except that type ALP has a keyway on the outside diameter to transmit the torque.

Two paper seals are delivered with each unit to be placed between the outer race and cover plates.


 

Type

Size

Overrunning speed

Number

Weight

Drag torque

AL
ALP

dH7

nimax2)

namax3)

Dh7

D2

z

L 1

L4)

B

t1

 

 

TR

[mm]

[min-1]

[min-1]

[mm]

[mm]

 

 

[mm]

[mm]

[mm]

[mm]

[kg]

[Ncm]

12

4000

7200

62

20

3

42

20.3

27

2.4

0.5

3.4

15

3600

6500

68

25

3

52

30.3

34.1

2.9

0.8

4.1

20

2700

5600

75

30

4

57

34.3

39.1

3.5

1

8

25

2100

4500

90

40

6

60

37.3

42.1

4.1

1.5

14

30

1700

4100

100

45

6

68

44.3

49.1

4.1

2.2

23

35

1550

3800

110

50

6

74

48.3

54.1

4.7

3

60

40

1150

3400

125

55

6

86

56.3

62.1

4.9

4.6

72

45

1000

3200

130

60

8

86

56.3

62.1

5.5

4.7

140

50

800

2800

150

70

8

92

63.3

69.1

5.5

7.2

180

55

750

2650

160

75

8

104

67

73.1

6.2

8.6

190

60

650

2450

170

80

10

114

78

84

6.8

10.5

240

70

550

2150

190

90

10

134

95

103

7.4

13.5

320

80

500

1900

210

105

10

144

100

108

8.5

18.2

330

90

450

1700

230

120

10

158

115

125

8.7

28.5

650

100

350

1450

270

140

10

182

120

131

9.9

42.5

830

120

250

1250

310

160

12

202

140

152

11.1

65

1080

150

200

980

400

200

12

246

180

196

12.3

138

1240

200

150

750

520

260

18

326

240

265

15

315

3800

250

120

620

610

320

20

396

300

330

15

512

6100

ALM

25

2100

2800

90

40

6

60

37.3

42.1

4.1

1.7

22

30

1700

2500

100

45

6

68

44.3

49.1

4.1

2.5

37

35

1550

2400

110

50

6

74

48.3

54.1

4.7

3.2

66

 

NOTES

1) T max = 2 × T KN
» Refer to Selection page 10 to 13
2) Inner race overruns, values without lip seals
3) Outer race overruns
Keyway to DIN 6885.1
4) The dimension L includes up to size 50 the each
0.25 mm thick paper seals to be located on both faces
» Refer to mounting and maintenance instructions
page 16 to 19

MOUNTING EXAMPLE

 

 

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