Disclosure to Promote the Right To Information

Transcription

1 इ टरन ट म नक Disclosure to Promote the Right To nformation Whereas the Parliament of ndia 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 ndian 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 nformation, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New S (2007): Road hazard impact test for wheel and tyre assemblies (passenger cars, light trucks and multipurpose vehicles) [TED 7: Automotive Tyres, Tubes and Rims]! न $ एक न' भ रत क +नम-ण Satyanarayan Gangaram Pitroda nvent a New ndia 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 S 15794:2007 ndian Standard ROAD HAZARD MPACT TEST FOR WHEEL AND TYRE ASSEMBLES (PASSENGER CARS, LGHT TRUCKS AND MULTPURPOSE VEHCLES) CS ; ; C BS 2007 BUREAU OF NDAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELH December 2007 Price Group 4

5 Automotive Tyres, Tubes and Rims Sectional Committee, TED 7 FOREWORD This ndian Standard was adopted by the Bureau of ndian Standards, after the draft finalized by the Automotive Tyres, Tubes and Rims Sectional Committee had been approved by the Transport Engineering Division Council. The following standards may be referred for rims: S No (Part 2) : (Part 3) : 996 Automotive vehicles Rims General requirements : Part 2 Passenger car ~rst revision) 991 Automotive vehicles Rims General requirements : Part 3 Commercial vehicles rims (jhst revision) Title (Part 7): 1983 General requirements for rims for automotive vehicles : Part 7 ndustrial truck rims For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with 1S 2 : 1960 Rules for rounding off numerical values (revise~. The number of significant places retained in the rounded off value should be the same as t!!at of the specified value in this standard.

6 ndian Standard S 15794:2007 ROAD HAZARD MPACT TEST FOR WHEEL AND TYRE ASSEMBLES (PASSENGER CARS, LGHT TRUCKS AND MULTPURPOSE VEHCLES) 1 SCOPE This standard specifies the test wheel and tyre assemblies used with passenger cars, light trucks, and multipurpose vehicles. The test is limited to a frontal (radial) impact with both wheel rim flanges being impacted simultaneously. 2 DEFNTONS For the purpose of this standard, following definitions shall apply. 2.1 Frontal mpact Test Fixture Test fixture for evaluating the frontal (radial) impact performance of wheel and tyre assemblies. 2.2 Drop Mass Mass acting through the striker. 2.3 Striker The shaped projection bolted to the pendulum that impacts the wheel and tyre assembly. 2.4 Drop Height The falling height of the drop mass (the height of the striker mass center above the wheel hub center). 2.5 Striker Mass Centre The intersection of the vertical axis through the fulcrum and the horizontal axis through the striker nose centre with the pendulum hanging freely. 2.6 Wheel-Holding Fixture Fixture used to securely hold the wheel and tyre assembly during testing. 2.7 Pendulum The swing arm having a fhlcrum at one end and the striker at the other end. 2.8 Bed Plate A substantial member used to locate and clamp the holding fixture securely. 2.9 Frame A substantial member used to support the fulcrum of the pendulum. 3 TEST PROCEDURE 3.1 Wheels and Tyres for Tests New wheels and tyres intended for use on passenger car, light truck, or multipurpose vehicles should be used (the test wheels and tyres should not be subsequently used on a vehicle). 3.2 Test Equipment Road hazard test fixture (see Fig. 1) consisting of, a) A mm pendulum having a drop mass of 54 kg (see Fig. 2), b) A rigid fkame to support the pendulum, c) A device for raising and releasing the pendulum, d) A device for limiting the impact to one hit, e) A very low friction (self-aligning ball bearing) fulcrum, f) A striker (see Fig. 3), and g) Gauge for measuring the drop height Bed plate for rigid support of the frame and the wheel-holding fixtures. Wheel holding fixture having a spindle height that matches the height of the striker nose when the pendulum is in its ffee position. The stiflhess of this fixture isvery important; it should not be less stiff than the fixture detailed in Fig Equipment Calibration The impact force on the wheel and tyre assembly depends upon the length of the pendulum, the inertia of the pendulum, the shape of the striker and the friction at the fulcrum. Calibrate the equipment to be sure that the impact force is always correct: a) b) c) d) e) 9 Confirm the pendulum length at mm; With the pendulum horizontal, check that the mass at the striker nose is 54 kg (see Fig. 5); Measure the total swing mass of the pendulum (164 kg); Confirm the included angle of the striker nose (1200); Confirm the nose radius of the striker (50 mm); Confirm that there is no friction or binding of the fulcrum by measuring the velocity of the striker at 5 degrees before bottom dead center when released from the horizontal position (23.33 krnlh); and!3) With the pendulum hanging freely, check that the striker mass center, used to measure the drop 1

7 1S 15794:2007 height, is located at the intersection of the vertical centerline through the fidcrum and the horizontal centerline through the striker nose (see Fig. 5). 3.3 Test Procedure When running the impact test all necessary precautions shall be taken to provide a safe operation Before the test, examine and measure the test wheel and the test tyre and record all the criteria to be evaluated Mount the test wheel to the wheel-holding fixture and locate the assembly so that both the wheel flanges are just touching the striker with the pendulum in the free hanging position. The centerline of the rim should also be aligned with the centerline of the pendulum and striker. Clamp the wheel-holding fixture securely to the bed plate Mount the test tyre to the test wheel and inflate to the required test pressure. Reinstall the tyre and wheel assembly to the holding fixture and tighten the wheel fasteners to the specified torque Raise the striker to the predetermined drop height (height of the striker mass center above the wheel hub center) Allow the pendulum to fall freely from the predetermined height (a mechanism may be operational that will prevent any rebound impacts) After the single impact remove the wheel and tyre assembly from the wheel-holding fixture and dismount the tyre Examine and re-measure the test components and record any changes to the criteria being evaluated. 4 PERFORMANCE CRTERA The wheel is considered to have failed the test if any of the following: a) visible fractures penetrate through a section of the centre member of the wheel assembly, b) centre member separates from the rim, and c) tyre loses all air pressure within 1 min. The wheel is not considered to have failed the test by deformation of the wheel assembly or by fractures in the area of the rim section struck by the face plate of the striker.

8 SELF-ALGNNG PENDULUM SUPPORT FRAME r -. r -. r- 1! 1 t w TYRE BED PLATE ~\ STRKER MASS CENTRE1 i Alldimensions in millimetres. FG. 1 ROADHAZARDTESTFXTURE.. N o CJ

9 1S 15794: L --E P1 TUBNG STRKER LFT HOOK y Alldimensions in millimetres. FG. 2 PENDULUMASSEMBLY

10 t--- -io!---i 6 T t---l 30 u--l u! 2 Lq75,fJ L 300 SECTON A - A All dimensions in millimetres. FG. 3 DETALSOFSTRKER

11 ROUND STEEL TUBNG CD203 x12.6 THCK h WHEEL ATTACHMENT OPTONAL m 25-9 Jls t r 1 ( z!! 4?. L-=- -A FG. 4 All dimensionsin millimeires. DETALSOFWEEL-HOLDNG Rxm

12 ~ORZONTAL CENTRELNE THROUGH STRKER NOSE WHEN PENDULUM S HANGNG FREELY JfERTCAL CENTRELNE THROUGH FULCRUM WHEN PENDULUM S HANGNG FREELY ~ -1 CENTRE OF PERCUSSON MASS CENTRE ~,2/ ENTRE OF GRAVTY 54 kg - # i= kg f FG. 5 A!!dimensions in millimetres. MASSDSTRBUTON REQUREDFORPENOULUM}. SSEMBLY

13 Bureau of ndian Standards BS is a statutory institution established under the Bureau of ndian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright BS has the copyright of all its publications. No part of these publications maybe reproduced in any form without the prior permission in writing of BS. This doesnot preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BS. Review of ndian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reafi%med when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of ndian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of BS Catalogue and Standards: Monthly Additions. This ndian Standard has been developed from Dot: No. TED 7 (466). Amendments ssued Since Publication Amend No. Date of ssue Text Affeeted Headquarters: BUREAU OF NDAN STANDARDS Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi Telephones: , , website : wwnv.bis.org.in Regional Offices: Telephones Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELH { Eastern : 1/14 C..T. Scheme V M, V..P. Road, Kankurgachi , KOLKATA { > Northern : SCO , Sector 34-A, CHANDGARH Southern : C..T. Campus, V Cross Road, CHENNA Western : Manakalaya, E9 MDC, Marol, Andheri (East) , MUMBA { , Branches : { { , , AHMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COMBATORE. FARDABAD. GHAZABAD. GUWAHAT. HYDERABAD. JAPUR. KANPUR. LUCKNOW. NAGPUR. PARWANOO. PATNA. PUNE. RAJKOT. THRUVANANTHAPURAM. VSAKHAPATNAM. Printedat SimcoPrintingPress,Delhl