HOLD BACK DEVICE

 

Wiperdrive are prime Group of engineering industries, functioning more than two decades, catering the needs of almost major industries with their PRODUCT RANGE : FREEWHEEL (ONE WAY) CLUTCHES, KEYLESS TRANSMISSION ELEMENTS, TENSIONER NUTS, SPEED VARIATIORS, CAM FOLLOWERS (TRACK ROLL) ETC;

Freewheel-oneway-Clutches (Unidirectional Couplings) leads to reduction in cost as compared with separately controlled other equipments/attachments.No driving contact between inner and outer ring in one direction of rotations and there is driving contact between inner and outer ring in the direction of rotation which transmit torque.Three type of freewheels,viz.1.Sprag1.1.standard,1.2 Indexing ,1.3 Centrifugal lift off 2.Roller,3.Cam-Roller Combined,used as Overrunning Coupling,Indexing(feeding)& Backstopping clutch.

Keyless Transmission Elements :Shrink fit connection of special variety. Versatile, high fatigue strength, even under alternating torsional stresses. Shaft/hub has no keyway, minimizing notch effect. Most suitable for shaft hub connection. Easy mounting and removal, wear free, perfect alignment, easily adjustable, economical.. shaft mounted gearing, gear wheels, chain sprockets, lever, cams, break drum and countless other application. Elements are available in modesl N7012, N7012.1, N7013.0, N7013.1, N7014, N7015, N7016, N8006, N250, N500 and Shrink Disc N4071, N4091 & split type NS4051, NS4071, NS4091.

Tensioner Nuts : can be instead of standard hexagonal nuts on stud OR bolt for general mechanical connections-heavy Or medium duty. Bolt tension-clamping load-by tightening multi clamping screws with standard tool-torque wrench only.

Variable Speed Units : are compact in construction much useful and advantageous where infinitely variable speed drive is required. Speed variation by hand wheel / by other mechanism in lace of hand wheel / by other mechanism in place of hand wheel. Gives out put ratio 6:1 Input power 0.25 to 2.2K.W. Out put speed 1.5 to 1700 RPM.

Cam Followers / Stud Type Track Rollers / Track Rollers : are with standard as well as eccentric stud, cage guided ready to fit. These are equiv. To KR/CR/CF & are used for heavy loads and medium speeds.

All Wiperdrive PRODUCTS have versatile functions and are extensively and economically used in all most all industries and have gripped the manufacturing industries as a whole


These units do not have bearings so to ensure fault-less operations inner & outer ring have to be aligned properly concentric and square with reference to the shaft axis.For this,the inner dia"D1" of outer ring of Hold Back Device is to be firmly fitted on centering spigot of stationery part of machine /gearbox.It is advisable that inner dia"d1"should not be kept dry but be cleaned & slightly oiled.Spigot is to be machine perfectly square with reference to shaft axis and dia "D1" within "h7" limit.The height of spigot is to be keept such ,as that the centering spigot must touch NOWHERE to th ecage portion.

To insert inner ring with sprag cage assembly,keep sprag in disengaged position by means of thin flexible wire ring OR any stretchable ring,slightly turn in freewheeling directions during entering in outer ring .While 1/3 portions of all sprags enter in the puter ring ,remove wire OR stretchable ring and insert total sprag cage assembly.

Lubrication:

Normally ,these units are running in disengaged position,lubrication is required to protect against corrosionsonly and most probably this is covered by oil immersed lubrications,in gear boxes & other machines.Where applications differ,(fig.3) we suggest to fill 1/3 portion of unit by low viscosity hydraulic oil.

Before putting into operations proper lubrication should be provided.Hold Back Device-a versatile Products -equiv .to FXM,RS/BI,CLS seriesNormally ,these units are used as overrunning clutches,where the shaft overruns at high speed.These units are having Individually spring loaded centrifugally lift off sprags,housed in a cage by means of pins connected with rotating inner ring having driving contact with outerring .When the lift off speed is reached the sprags automatically disengage completely from the contact surface of the outer ring and rotate contact free ,hence sprags are wear free & having longlife.

 

dH7

 

D

 

l W D1 D2 torque Nm Lift Speed (rpm) H
Nos Dia

20

25

30

35

40

45

50

60

70

80

90

95

100

120

140

185

190

220

90

95

100

110

125

130

150

175

190

210

230

245

270

290

310

400

420

260

 

 

35

35

35

35

35

35

40

60

60

70

80

80

90

90

90

105

105

105

35

35

35

35

35

35

40

50

50

60

70

70

80

80

80

80

80

80

 

66

70

75

80

90

95

110

125

140

160

180

180

210

210

240

310

330

360

78

82

87

96

108

112

132

155

165

185

206

218

240

258

278

360

380

410

120

180

250

300

450

500

800

1200

2000

3000

3300

4200

5800

9000

12200

16500

20000

27000

800

750

700

625

580

550

500

450

450

430

400

400

350

350

300

290

275

250

6

6

6

8

8

8

8

8

12

12

12

12

12

12

12

12

12

16

6.8

6.8

6.8

6.8

9

9

9

11

11

11

13

13

17

17

17

21

21

21


Only Fitting/External dimensions can be made according to other equivalents,if required .
Other sizes on request Design subject to modifications All Dimensions are in m.m.

 

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