Disclosure to Promote the Right To Information

Transcription

1 इ टरन ट म नक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. ज न1 क अ+धक र, ज 1 क अ+धक र Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New IS (1988): Gear Type Flexible Couplings [PGD 31: Bolts, Nuts and Fasteners Accessories]! न $ एक न' भ रत क +नम-ण Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge! न एक ऐस खज न > ज कभ च0र य नहB ज सकत ह ह Bhartṛhari Nītiśatakam Knowledge is such a treasure which cannot be stolen

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4 UDC ts : I Indian Standard SPECIFICATION FOR GEAR TYPE FLEXIBLE COUPLINGS I. Scope - Covers general requirements of gear type flexible couplings used for connecting two ;haft ends for power transmission.!. Classification - The couplings specified in this standard are classified into two types, namely, rype A with both the hubs flexible having integral sealing ( O-rings ) arrangements ( see Table 1 ) md Type B with detachable sealing arrangement ( see Tables 2 and 3 ). 1. Ratings and -Dimensions -The ratings, dimensions and other requirements of the couplings ihall be given in Table 1 for Type A and Tables 2 and ~3 for Type B couplings. Manufacturers shall jrovide the service factor table for selecting the suitable couplings for different applications. L Materials and Construction!.l The toothed hubs and sleeves (or casings) shall be made of steel conforming to 45C8 of IS : 1570 : Part 2)-1979 Schedules for wrought steels for general engineering purposes: Part 2 Carbon steels, unalloyed steels ), alternatively sleeves can be made of cast steel conforming to grade of S : 1030-l 982 Specification for carbon steel casting for general engineering purposes ( third revision) tnd shall be heat treated to a hardness HB The bolts shall be made of steel conforming to C45 of IS : 1570 (Part 2)-1979 and suitably lardened, and nuts shall conform to property class 4 of IS : 1367 IPart 6)-1980 Technical supply conditions for threaded steel fasteners: Part 6 Mechanical properties and test methods for nuts with specified proof loads m( second revision ). 4.3 The gear tooths shall be cut by module cutters only. The tooth characteristics including crowning/ barreling shall be as agreed to between the supplier and the user. 5. Seal~ing 5.1 The sealing arrangement for the couplings shall be integral with the sleeve,( casing] or alternativc arrangement shall be made as agreed to between the supplier and the user. 5.2 Arrangement of sealing such as O-ring which can withstand high degree of temperature up tc 120 C or felt conforming to IS : 1719-I 979 Specification for wool felt ( pressed ) ( second revision )l or, other sealing as lin seals, etc, shall be optional, subject to agreement between the supplier ant the user Figure 1 shows the schematic sealing arrangements of couplings. 6. Lubrication 6.1 Provision shall-be made for easy filling and discharge of the lubricant with plug suitably located. 6.2 For application, where ambient temperature is within 80 C a calcium base EP type grease i! recommended and for temperature above 80 C oil should be used. 6.3 The manufacturer shall indicate the quantity of lubricant to be used in each size of coupling. 7. Balancing - As the couplings are machined all over, generally it is not necessary to do balancing For specific application, however, an agreement between the supplier and the user can be made. 8. Marking 8.1 The coupling shall be marked with the following details on the periphery of the casing: a] Manufacturer s name or trade-mark; b) Type and coupling number as specified in Tables 1 and 2; and c) Designation of this ~standard. 8.2 Standard Marking - Details available with the Bureau of Indian Standards. 9. Packing - The coupling shall be suitably packed in wooden boxes to prevent damage -durin transit. Adopted 5 May May 1989, 8IS I I _..IC... _c..i_... n.-..._.m_,. BuntA-u ul- INIJIAN 3 IAIVlJAnlJ3 MANAK BHAVAN, 9 BAHADUR SHAH ZPFAR MARG NEW DELHI ~ Gr 3

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6 :oup1- kw per Maximum Maxi- d D, D, D, D4 i B I C Requ- Dia Fit Bolts,p, :~ Approx ing 100 Torque mum ired of 4 tgd* No. rpm in Nm rpm End Pilot in kg* Value From To Clear- Bore in ante kg.m2 e P------P-F MlOx MlOx M12x IO M12x M12x M16x M16x M16x i 10 M2Ox M20x M20x i M20x M30x M30xllO M30xllO M36x IO M36x M36x i IO M48x Note - illustrative figure is for guidance only. *Dimensions, tolerances, etc as per IS : Hexagon fit bolts (first revision)'. tgd2 value is the measure of polar moment of inertia of the couulings. its selection for any application. It is utilised for checking up the flywheel effect of the coupling on the prime-mover during G.. -;3 8 en t z _ 8i

7 ZS : T988 TABLE 2 DIMENSIONS OF GEAR TYPE FLEXIBLE COUPLINGS, TYPE B ( Clauses 2, 3 and 8.1 ) All dimensions in millimetres. -I LUBRICAIING PLUG C :oup1- Maximum Maxi- Finish D l. I ECR Pitch No. of Bolt Size ing mum Bore Circle Bolt No. rpm Dia- Holes kyow Torque meter Nm Max Min vm ~ ~------_ MlOx MlOx MlOx MlOx MlOx M12x M14x M16x M16x80 IO IO M18x M18x M20 x ?I M22xlOO M24x M30x M42x M48x180.._a ** _. NoXe -1 - lllusrrarwe rlgure Is tor gulciance only. Note 2 - Pilot bore shall be 5 mm less than the minimum finished bore. Note 3 - For dimensions of spigot, refer Table

8 TABLE 3 DIMENSIONS OF SPIGOT ( Clauses 2 and 3 ) All dimensions in millimetres. Zoupling 01 vv d: dz Jl No. H7 n I

9 IS : 'l2405.kl988 0 RING FELT SEAL III_ -II OIL SEAL FIG. 1 SCHEMATIC SEALING ARRANGEMENTS OF -COUPLINGS EXPLANATORY NOT~E This standard has been prepared in the light of the present technical practices followed in India. 6 Printed at Printrade, New Delhi, India